A downloadable game for Windows, macOS, Linux, and Android

Buy Now$20.00 USD or more


The Symbiant is a story-rich and erotic (18+) BL/yaoi adult visual novel about two adult men, both from vastly different worlds, embracing their sexuality and their newfound romance. It is also a tale of interstellar friendship and being gay in space!


In the year 5066, Danya and his alien friend Juniper are manning The Ameretat, a humble spaceship that transports goods across the Milky Way. 

After a troubled transport gig that left their beloved ship in need of repair and their bank account empty, the team is offered a generous deal they cannot refuse: transporting a beautiful and mysterious alien who calls himself Brahve.  Sometimes at night, Danya hears strange things from Brahve's room. What could he be hiding in there? And how will it affect the connection that's quickly growing between the two men?

Content disclaimer: This visual novel includes graphic and uncensored depictions of sex between men and tentacle creatures, as well as a variety of sexual practices including BDSM and consensual rape-roleplay. All sex scenes in The Symbiant are consensual.

Check the SFW version if you don't want to see sexual content.

— Full game features —

Listed at $20 base price. Everything else is just extras!

  • 55K words
  • 3-5 hours
  • 9 NSFW scenes
  • 20+ unique CGs
  • Full English voice over
  • Localized in 12 languages
  • 1 love interest, 2 routes, 4 endings
  • Original soundtrack
  • Reversible characters (who can both top and bottom)

— The Symbiant Re:Union  —

Re:Union is a fandisk set after The Symbiant's good endings.

It contains 2 stories with new locations and new romantic moments between Danya and Brahve. $105 itch buyers and $20 patrons will soon be able to play a WIP version as it's being made.

  • Releasing on Q1 2024
  • Check our patreon for the latest build!

— Price list  —

$20+The Symbiant game + Choice & Achievement guide
[pre-order] The Symbiant Re:Union
The Symbiant OST
$32+The Symbiant 4K CG pack
$35+The Symbiant artbook
$105Re:Union early access

Example: if you pay $30, you get everything equivalent or below that price: the game + Re:Union + OST.

Unfortunately, itch.io doesn't let you selectively pick addons or send separate payments for them. Should you spend $20 and later wish for Re:Union, you will have to re-buy everything again OR buy them separately.

Separate extras purchases:

NL sign up




Buy Now$20.00 USD or more

In order to download this game you must purchase it at or above the minimum price of $20 USD. Your purchase comes with a Steam key. You will get access to the following files:

The Symbiant Endings & Achievement Guide 6 MB
Version 1
The Symbiant for PC 840 MB
Version 27
The Symbiant for MAC 792 MB
Version 25
The Symbiant for ANDROID 839 MB
Version 28
[pre-order] The Symbiant Re:Union
if you pay $28 USD or more
The Symbiant OST 612 MB
if you pay $30 USD or more
Version 1
The Symbiant CG pack 896 MB
if you pay $32 USD or more
Version 1
The Symbiant Artbook 93 MB
if you pay $35 USD or more
Version 1
Re:Union Early Access for PC 641 MB
if you pay $105 USD or more
Version 11
Re:Union Early Access for MAC 610 MB
if you pay $105 USD or more
Version 11
Re:Union Early Access for ANDROID 636 MB
if you pay $105 USD or more
Version 11

Download demo

Adult Patch for STEAM - Manual Install 161 MB
Version 5

Development log

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Viewing most recent comments 1 to 40 of 100 · Next page · Last page

Played the demo a few months back & it is easily one of the best visual novels ever made. Look forward to purchasing the full thing soon


Hello game developers! I am a game fan and I really like the games you make! The plot of your game is really amazing! I would like to recommend your game to my close friends and also create non-profit fan products to share my love with my partners. (I'm not sure if the machine translation here is accurate, but I want to draw some fan works and print them into some laser tickets, not for profit but for gifting to friends) Can you allow me to do this? Looking forward to your reply , thanks!🥺 


Just played the demo, and honestly-  I'll be buying this game some time in the future, for sure!

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Is the Steam key from itch.io the uncensored version?  I originally bought the game from Steam in Germany, but refunded it. Why does it not show the adult patch even when you click on "show the hidden DLCs"? Is it only region locked in Germany? Shouldn't it be written somewhere that you have to install a patch for the full content? I only noticed the lack thereof while I was already playing the game.

I know there`s an adult patch for Steam here, but after trying to hook Textractor to the game it kinda broke on my computer(text was overlapping). 

(1 edit) (+1)

Hi Papierbluete. To answer your questions:

  • The adult patch, like all adult content on Steam, are banned in Germany
  • We are literally not allowed to talk about the adult patch, or even IMPLY THE EXISTENCE of the adult patch on Steam. Not in the product page, not inside the game itself and not in the newsletters
  • What you're asking is thus completely impossible, and outside of our control. Doing what you're asking would ban the entire game altogether from Germany. We know, it happened to us before
  • However, we put the adult patch for free on itchio here. You can place it inside a Steam-purchased game
  • On itchio, we have no such restrictions. The game comes uncensored by default on the itchio version.

Is there any particular reason you're using Textractor?

I see that sucks:/ what reason does Steam have for banning it? 

Textractor to hook the text for language learning purposes.

Long story short, Steam is forced to comply with German laws.

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¿Si compro el juego desde Steam y tengo la cuenta conectada, podré descargar la versión para android en el móvil? es por hacer el pago desde la cartera de Steam pero quiero jugarlo en el teléfono (la versión +18 con todo el contenido)

Hola ! Si compraste el juego en Steam, envíanos el comprobante de compra (por ejemplo, correo electrónico de confirmación) al siguiente correo electrónico: inquiry.heartcoredev@gmail.com

你好,我在steam上买了这个游戏,但是没有dlc没有办法解锁格外内容,我在steam的通讯上看见可以直接询问获得dlc,大概是回答“想吃肉”?Hello, I bought this game on Steam, but there is no way to unlock special content without DLC, I saw on the communication on Steam that I can directly ask to get DLC, probably answering "want to eat meat"?


Excuse me, but where do I download this? I don't seem to see it here

https://heartcoredev.itch.io/smb-18patch This link should work.


thank you very much!

Hii, sorry if this a stupid question but is the main game completed? I want to buy it but I don't know of its episodic/ still in development!

It is! What's currently in development is the fandisk / extension of the main game's endings.


I bought the 105$ pack when the game came out but will I get the after stories as well or do I have to pay that separately 

(1 edit)

Everything is included in the $105 pack, including the After Stories!

In fact, should be able to see the Early Access version of the After Stories in this page's downloads.


I loved this shit it was great good job


Sorry,  but I keep crashing.   Right after Brahve goes to bed then you see the cockpit, says some line about jumping into space, then it lags twice and crashes.   I'm running the program thru the website on my android phone.   I plan on buying the vn eventually.   I really like the art.  Actually your other game synthetic.....  ian the biot,  actually crashed too, but I think that was my fault.   It crashed after I hit the go to other apps button.  I have meat hooks for fingers alot.  With the biot vn I was about 2 hours in and forgot to save...    I really like it though, another one I will be buying when I can.  Ty for making them.


"Good" Ending 2 hurts so much T^T Maybe I'm on edge 'cause a VN I read the other day turned out to be *brutal*, but all I want for these precious boys is one unambiguously good ending, and one *even better* ending. I hope After Stories comes out soon to heal my heart. 🥺 


oh, no, I just read when AS is coming out! all right..... I'll just play the best route again and bask in the happy there.

Hope you liked the ride! :D

In the first after story that takes places after that ending, Danya and Brahve definitely need to work harder to get their (eventual) happy ending.

(1 edit)


I was hoping for an expanded cg scene, when main character first meets the symbiant and it shoves its tentacles down his pants, where you could choose to let the symbiant keep going, and it progresses to it unzip his pants and taking them off. Then you can see the symbiants tentacles sucking him off. Also I can imagine the symbiant having mini tentacles inside his tentacles, and it would have been hot to see them explore the main characters peehole. 


You are a talented artist, and game dev. I hope you make more content like this. 

Maybe a love story about wizards? I know wands out is on steam, but the quality is terrible, and too silly. 


Sometimes I read something and I just know it comes from a F95 user.


I really loved this and so did my girlfriend although me and her were just like "KISS ALREADY BISH"

Glad you and your girlfriend enjoyed the game! :D

yeah, good job on it!

Gi it keeps saying it cant oatse the apkHi i downloaded the apk but it keeps saying it couldn't parse the file

Hi can you please show us the error message?

I’ve attempted to buy it again, but it still won’t work, neither did I get a notification of a purchase, 

So I have now spent at least $50 on this..I feel bad for being rude 

Please send us an email through inquiry.heartcoredev@gmail.com so we can figure something out. If your payment didn't work that means you were NOT charged.

Additionally, if itch doesn't work for you, you can try buying the game on Steam instead: https://store.steampowered.com/app/1883090/The_Symbiant/

Hi. First, I would like to share my appreciation for the game, I liked the stories, the CGs and most of all, the voice acting. ~  

However, recently I reopen the game  and the images overlap, from the background to the CGs... I tried to redowload the game, but the issue remains. 


Also, I've purchased the pre-order version of the game (35$) and I didn't get the after-story part 1 pre-order version... (Is it normal ?) 

Thank you in advance Heart Core Dev,  J.

Hi Jaunathan, this is a common issue if your graphic card drivers are out of date or if you're using an old computer.  

You can try the following method:

  1.  hold the SHIFT key while clicking the game launch button
  2.  a grey screen will appear instead of the game, that's normal
  3. select "Force GL2 Renderer", then "Quit"
  4. Restart the game.
  5. If the issue persists, go to that grey menu again and select "Force ANGLE2" Renderer" instead

Please let us know if that helps. As for the second question, the After Stories aren't out yet because we haven't finished making them...! That's why purchasing their "tier" right now counts as a pre-order. You will be notified when they are out. We are hoping for Q1 next year.


Hello again, 

I've tried the second option, and----- It worked ! Thank you  (I really thought the issue would persist). And, thank you again for your answer, your instructions.. 

I'll wait patiently until the next uptade. J. 

Hi! If I purchase the game here instead of steam, do I still need to download and install the adult patch manually? And if so, if I buy the game on steam, is it still possible to merge the patch with the steam version? I'm afraid I'm a little confused on how best this works :) 

dunno if you ever figured this out but the adult content is included in the download from this page. the patch is *for* the steam version.

is after stories 2 out yet cause when I go into the after stories it brings me to the first one

Hello! The After Stories aren't out yet, so if you paid $28 or more, you get the game and a pre-order of the After Stories. We're planning on releasing them on Feb 2024 at the latest date but hopefully sooner than that.

so even if I bought the 105$ pack I don't get the after stories with it?

To sum it up:

  • $28 purchase will unlock the After Stories after we've finished and fully released them
  • $105 purchase gives you early access to the After Stories, which is otherwise only accessible on Patreon right now

Hope that helps.

(1 edit) (+1)

Hello dear developers!

I am writing to you on the subject of a steam ban for Russian players. About a year ago, they banned the page of the game called My Time At Portia. Recently, it has become available again for Russian accounts. So.. maybe it's just a bug? Or is something mixed up or missing? I suggest you talk to the developers of the game My Time At Portia, maybe you will figure it out))

I really want to play Symbiant DLC, so don't leave us!) Bye! =))

(2 edits) (+1)

This is very upsetting because Russian is the first language The Symbiant was translated to and we know many SMB fans are from Russia.

But aside from asking them what happened, there is nothing we can actually do on our own to reverse the ban beside asking nicely. Perhaps they will answer faster if a lot of people ask them directly (through forums? creating a ticket? an email? I don't know) but we don't want to get other BL game developers and Russian fans in trouble either.

My Time at Portia's case is quite different, and they don't seem to speak English, so I'm not sure they will be able to help us. Thanks for the info bit though!


Thank you for the answer) And for your wonderful game)
I hope all problems will be resolved in your favor =)

(I will still buy all the DLC if they are available ;ъ )

So, about that.. we have received a confirmation from Valve that they have been contacted by Roskomnadzor demanding that they permanently remove the app from the region. Which means that Russia officially banned the game. :(


It's sad to hear that.I wish our government wasn't so homophobic.Even as hetero, it pains me to see how they negative relate to everything related to LGBT.



I bought the game on steam. But in Germany the adult patch is banned maybe ? 

Can i do something? 

Or when i buy it here, can i play it then? 

Sorry for my questions, i'm a little sad about this :(


Hello! You are in the right place to get the patch. It's the "adultpatch.rpa" file in the demo download section and it's free!

If you need instructions on how to install it, you can read them here.


Thank you so much 😭 it worked. I'm so happy now 


Enjoy the lewds! =D

(4 edits) (+1)

Why did you block access to the game in steam?Is there a special reason for this?A month ago it was available, and now access for my region is closed.Which is very sad.Since I wanted to buy it in the near future.

Upd. Nevermind

Just seen last tweet about ban .Our government is really dumb.

We asked Steam staff about it last week and we haven't gotten any proper answer from them. All we know right now is that Valve is the one who banned the game from Russia, not the Russian authorities. We asked them on un-ban the game, but we can't guarantee anything. :(

(1 edit)

I'm sorry that I lost my temper without understanding. I don 't dont mean to  be rude .This is very strange, considering how many LGBT games are available in Russia (I can freely buy any of them and have more than 20 on the acc), but for some reason they banned yours.I wonder if Valve trying be safe,since  LGBT laws get more stricted evey year here.But the same Dear Monster came a bit earlier  in january and they did nothing against it.So i really dont understand,why Valve did this with your game.And i sorry that you have to deal  with all these restrictions and problems.

Are Russian cards still accepted  if I decide to buy the game here?

No worries, we really hope Steam unbans the game. As it turns out they're the ones who did the ban, not Russian authorities.

Itchio accepts Paypal and Stripe (credit card), but we're not sure it's going to work for you.

Hello! If I want to play the NSFW version on Android, can I just purchase from this link?


(1 edit) (+3)

I love this game and I keep replaying the sexy stuff. :D I love how it's hot and "kinky" while still being very gentle and loving. <3 Can't wait for the afterstories! (Oh and of course, the voice acting and soundtrack are aaaweeesooomeeee!)

Thanks for leaving these super sweet words on this page! We're glad you enjoyed the game <3

Is there a way just to pay for the after stories?

We will create a separate page for the after-stories soon-ish. :)

Hi, just wanted to let you know that GOG has a broken download link to Symbiant adult patch and they have been unwilling to fix it for about two weeks now. So if someone buys the game over there and wants the patch they won't be able to get it.

(1 edit)

Greetings, we are sad that you had to comment on itchio in order to reach out to us. We tried updating the build through GOG's tools but it's still stuck in the oldest available version. We reported the issue to them and they'll probably get back to us next week.

In the meantime, the adult patch on this page should work if you haven't tried that yet.

(1 edit)

I’ve commented before on this, which was completely my fault since I clearly can’t read properly, but I’ve bought the game, and yet, I can’t get past the demo, on steam or Ichio, 

it is a tad bit disappointing as I’ve been looking forward to playing this, the demo was quite good,

(1 edit)

Hello, are you able to download any of the "FULL GAME" files? These are the ones  you are looking for. You are the first person reporting this issue.

I attempted too, but it either crashed my computer, or showed up blank

I also didn’t receive an email about my purchase, or a text message


hey! i purchased this on steam and i dont know why i cant see the plus 18 drawings? even tho in steam i clearly put im older than 18 years old.do you know why that happens?

Hello Zeiya,

Are you from Germany or China? If so, your country's laws prevent Steam from installing the 18+ patch. If you're not from these countries, then can you please check whether the game's Adult patch DLC is enabled in the game's steam settings?


ohhh that was the problem!! tysm i really appreciate

You can find the adult patch in this page. Link to installation instructions is at the top. :)



Sorry, I would like to ask a question.

If I receive a popup like the picture, does that mean I have successfully purchased the game? Because I didn't get any emails or anything like that...

Hi Alicys, this seems like the purchase page and doesn't seem like itch counts the game as purchased on your account. We haven't been notified of someone spending that amount either on our end.

just finished four routes and OMG our boy Danya is so hot <3 thank you for making this so my fantasy could be fulfilled <3  are there after stories coming? if so when are they coming? wish the dev could add some more kink elements to it (like rubber/latex/transformation/alien impregnation xoxo


the good ending made me tear up goddamn it 


also props to the dev for making juni more relevant because representation matters 希望后续赶紧出来呀


HEY. I just wanna say thank you all for your endeavour and kindness. I bought this game on Steam. But unfortunately, I was in Mainland China and was inaccessible to the adult patch. Yesterday I felt so bad that I could not satisfy myself in this wonderful game. But now I knew this website and I got the patch successfully. Just wanna say thank you very much, you save my day forever!!!!

We're super happy you're enjoying the game! :D


你好。你能给我看看错误信息吗?我还需要知道游戏的构建号,你可以在主菜单(标题屏幕)的右下方找到。构建号应该看起来像 "S-1.0.5"。

Hello. Can you please show me the error message? I also need to know the game build number, which you can find at the bottom right of the main menu (title screen). The build number should look like "S-1.0.5".


您好,我们更新了成人内容补丁。 你能试试重新下载吗?



I'm sorry, but an uncaught exception occurred.

While running game code:

ScriptError: could not find label 'scene_08_nsfw1'.

-- Full Traceback ------------------------------------------------------------

Full traceback:

  File "scenes/scene_08.rpyc", line 268, in script

  File "renpy/ast.py", line 1974, in execute

    rv = renpy.game.script.lookup(target)

  File "renpy/script.py", line 927, in lookup

    raise ScriptError("could not find label '%s'." % str(original))

ScriptError: could not find label 'scene_08_nsfw1'.

Windows-10-10.0.22621 AMD64


The Symbiant S-1.0.8

Tue Feb  7 22:00:28 2023


你能加入我们的不和谐服务器吗?我们可以尽力帮助你。通过快速消息传递可能会更容易。 不和谐链接>




(1 edit)

抱歉,Android 版本只能在 itch.io 上购买。购买 Steam 即可获得 PC、Mac 和 Linux 版本。

I love this vn I bought it right away on steam I ran through it pretty fast I was curious but my farther in law passed suddenly and have to leave state I can’t wait to play it again thanks so much for your hard work 

Sorry for your loss and hope you get the chance to play the game later!
BTW I find it amusing how so many people from Steam come on the itch page to talk about the game instead of Steam's forums x)

Désolé de vous déranger a nouveau, mais comme vous pouvez le voir sur le document ci-dessous, je n'ai pas le lien de téléchargement pour la version Android malgré l achat fait il y a 6 jours. 

Euh... Tu as acheté Synthetic Lover, qui est un jeu complètement différent de The Symbiant. :o

Page de Synthetic Lover : https://heartcoredev.itch.io/syntheticlover-sfw

Page de The Symbiant : https://heartcoredev.itch.io/smb


OK ,now that I finished the game a full review: I still LOVE LOVE the game, I believe Brahve is one of the most beautiful characters ever drawn(in all media), I like Juni and the fact that you made her an interesting character and not just a token best friend, and of course our MC is just an adorable muffin. Two SERIOUS OBJECTIONS though: one, the game is short! Understandable, since we have one love interest, but still I cannot forgive you ,unless...we have a sequel! So if you sirs and ladies who developed the game are reading this, pretty please after the After Stories make a sequel! I am not ready to say goodbye to my babies yet. And the second objection: please when you describe a lovey dovey smexy scene illustrate it also! There were some scenes only described and not shown (eg in the gym, or in the shower), and we simply need to see the same beautiful visuals like the rest of the game! That is all, great job guys and I will see you in the after stories!

Hello! I am trying to access the full game, however as I went through, the Chinese Simplified texts suddenly turned to English. Is this a bug or simply translation is not yet complete? Thanks!

Hello, please download the latest update of the game. This problem should be solved. :)

Bonjour je n'arrive pas récupérer la version Android que j'ai acheté car dans les liens que je reçois il n'y a que pour Mac et Windows. 

que puis faire pour avoir enfin la version Android ?

(1 edit)

Salut encore ! Si tu vas dans les "Downloads" de cette page, tu devrais trouver "The Symbiant FULL GAME for ANDROID", qui correspond à ce que tu cherche. Ce fichier est téléchargeable pour toute personne ayant payé $20 ou plus.

Bonjour,  je n'ai toujours pas reçu le lien du jeu pour Android que j'ai 🥺

Pouvez-vous me dire quand je vais le recevoir ?

(1 edit)

Salut encore ! Si tu vas dans les "Downloads" de cette page, tu devrais trouver "The Symbiant FULL GAME for ANDROID", qui correspond à ce que tu cherche. Ce fichier est téléchargeable pour toute personne ayant payé $20 ou plus.

£$105 for what exactly?

Permanent early access to the After Stories, for those who really want to support us and can't wait for the end of the year to start playing it.

If you just want the regular after-stories when they come out, that's just an extra $8. ($28 tier)




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