Any good F-Droid games that you have played?

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?