www.theoldcomputer.com

I don't play much on Android but I can get hooked by Candy Crush

One word:
Downwell
Yeah it was released 2016, but it still is the best Android game in 2019 2020.
And I say this as a mobile gaming hater.

And if you just want to zone out: Desert Golf

Oh and I also have some own games on the Playstore 110%free no ads or in game purchases:
Vector Sector (best of the bunch)
Flex Armstrong (raw, trashy, short)
Digital Firewood (fire simulation toy)