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That was Factorial Omega, and the issue was that Steam thought the main female character (who is lewdable) looked underage :P

No, I'm thinking of another game, I'll try again to find it.  It's possible this other dev was misinformed though.

I found it, the game is Goodbye Eternity (which at the time was called Extra Life) by RNGeusEX.  The dev talks about it here:

https://the-end-of-time.itch.io/goodbye-eternity/devlog/367070/should-chiaki-bec...

I hadn't seen before, but apparently after all the work the dev put into it, he still wasn't able to get Steam to accept the game.  He talks about it here: https://the-end-of-time.itch.io/goodbye-eternity/devlog/453593/fresh-news

Hopefully you are able to get it to work, or even better SubscribeStar picks up enough :)