I have been working on a game for Bitcoin users for some time now, the initial name is "BitNova". It's a clone of Ogame game developed in the spirit of Open Source with the possibility to earn some money in Satoshi. The game is free2play (there are no micropayments).
Unfortunately I don't have much to show, because I want to keep a little bit of a secret from the premiere (how will it go on January 1, 2021).
The game works, but due to the fact that the game engine is not officially developed and I take care of it myself - I have to add PHP7.4 support and some other things (but it goes well).
Withdrawals can be in Lightning Network and RSK (these features are implemented), Liquid Network if I have time to learn the tools.
Playing as I said it is an Ogame clone - if someone has played and likes to remember what it was like I don't think they will fail. If someone doesn't like retro games, they may not like a browser game from the early 21st century.
However, I believe that we have such a large community of users that the server may have problems handling such traffic! ;)