Almost all are Unity yes. I think Casual Crusade might be the only exception. Why don’t ”recent” Unity games work for you? Web and standalone builds both?
This is probably a driver limitation of Nouveau 1.0.12.
Nothing works, not even Casual Crusade.
If you want you can see what I wrote in the game Gobliiins5:
https://itch.io/post/8901247/reply
Kind regard