Pathos NetHack (The OG Roguelike's very newbie friendly fork and UI)

Rogue Saga (A simple, bare bones Roguelike, nice for a casual run)

Orna (If old school Final Fantasy were Pokemon Go, and didn't have predatory monetization schemes) Heroes of Aethric is its non-GPS sibling.

Most of my free android games came from when Amazon did its Amazon Underground thing years ago, so you're kinda SoL on that, sorry.