Puzzle
- Rocks'n'Diamonds - Digging for diamonds while avoiding boulders and enemies
- Enigma | github - Marble puzzles (and much more) inspired by the classic game Oxyd
- GNU Robbo - Solve rooms (puzzles) with your robot
Space
- Oolite | github - an open-world space opera (inspired by classic game Elite)
- Kobo Deluxe - 2D scrolling space shooter, destroy star bases with your ship
- Open Tyrian - Arcade-style vertical scrolling shooter