Unciv for Android. It’s basically Civilization 5, but FOSS.

Shoutout to Iji, too. Amazing soundtrack and lots of replayability. It’s an old game by now, but it’s also free. Sidescrolling platformer, killing is optional.

Assault Android Cactus. Dunno how well known the game is, but it’s one of the best twin stick shooters/bullet hell I’ve played, with the android girls full of charm.