"Puzzles" by Chris Boyle on F-Droid, a port of Simon Tatham's 40 logic puzzles

Check this link for more info: https://chris.boyle.name/projects/android-puzzles/

There a Github list of Android FOSS with a small games section divided into subgenres. But like I said, it's pretty small.

On Droid-ify you can sort just by games but then filter the first stuff you see by recently updated. There's quite a few puzzle type games being actively maintained. Various types of crossword games, mine sweeper, chess, suduku, lexica, solitaire, 2048, Falling Blocks, a few tower defense games. You can also install an emulator (Lemuroid) and have them play old GBA games, etc.

Puzzles (40 single-player logic games) I recommend this package on f-droid for puzzles. As for an organised list, f-droid is pretty lacking in terms of subcategories within it's categories, but I have skimmed that whole category a couple times just to see if anything is interesting. There is also a solitaire package in there. Simple Solitaire Collection (Solitaire game collection with 17 games)