There is a surprising number of gems in F-Droid. Simon Taltham’s Puzzles is excellent, as is Breakout 71. Shattered Pixel Dungeon is fun too, and of course I live emulating games with Retroarch. Lichess is neat and has a lovely Android client if you play chess.
Any other good games on F-Droid?
It really is very fun, and I like that it auto-pauses when you let go of the paddle