It seems like MacOS on M1 architecture can play almost everything! Like, there are so many titles that don't have OSX listed as ever being released for, but it can either be played out the box or with a slight tweak. But I guess that does preclude Steam releases if you don't have direct access to the per game, installers.
And nowadays these indie games release on all major consoles, mobile, and windows, macos.
What are you encountering? A few examples on whats missing for you?