Brawl stars: fun, quick and action packed. Not very deep strategically, but overall pretty fun.
Archero: fun and action packed, I especially like the premise, but gets dull quickly
Evolution (board game port): really nice.
Hearthstone: Battlegrounds (new, free, autochess - like mode) is really fun.
Game boy emulator: a much better Pokémon experience since you can speed up the game, and get through boring parts super quickly.
Age of Rivals: surprisingly complex, and fun. Deckbuilding game that is rather small and unknown, but I can still find people for online plays.
Supreme Duelist: it's the only fighting game that I know of that can be played with two players on one phone. It's incredibly unpolished and "bad", especially in the lack of tutorial, but it's actually kinda fun. (Suggestion: pick a simple weapon at first and fight a bunch of enemies, soon enough you'll know how to play. Up is jump, down is shield, and releasing your button uses your special ability)