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?
I’ll check Block Drop out! Searching for it also pops up a Blokus clone, didn’t know that existed!