Mobile games usually get a bad rep as they’re usually asset flips and/or MTX-ridden and/or ad-filled, etc., and I’m sure this is actually the case for most games on the app/play store. But are there any ones that are actually good, maybe just something to pass the time with?
Piggybacking onto this (all of these are FOSS):
Endless Sky is a 2D sandbox space sim. It’s a spiritual sequel to the old Escape Velocity: Nova, and has very active development.
Feudal Tactics is an extremely simple strategy game that can nonetheless be quite hard.
Battle For Wesnoth is a whole-ass fantasy campaign turn-based strategy game that has been ported to mobile. Think Warcraft but turn-based.
Arx Libertatis is a port of Arx Fatalis, a first-person RPG. This one is still on my list to try out, but it looks interesting.
Feudal Tactics looks like a Slay clone. My favorite Slay clone is Konkr, playable in a browser.