Here’s a good start.
Fillets-ng (sokoban puzzler)
Simon Tatham’s Portable Puzzle Collection (sgt-puzzles)
Sauerbraten (FPS)
0 A.D. (RTS)
Holotz Castle (platformer)
Xmoto (motorbike trials riding)
Kobodeluxe (shmup)
Neverputt (minigolf)
Here’s a good start.
Fillets-ng (sokoban puzzler)
Simon Tatham’s Portable Puzzle Collection (sgt-puzzles)
Sauerbraten (FPS)
0 A.D. (RTS)
Holotz Castle (platformer)
Xmoto (motorbike trials riding)
Kobodeluxe (shmup)
Neverputt (minigolf)
Numpty Physics, Box Stacker(Fdroid) or Neverputt are all pretty fun.
PowderToy is excellent as mentioned above.