Henry's Spaceship Shooter is a tiny arcade game for one player. It is based on libSDL, libSDL_ttf, and libSDL_image. The graphics are black-and-white, which makes the files very small.
Dudeball NG is an arcade game for one or two players. The rules are simple: each player has to take 'the dude' to the opposite side of the playing area.
MailSnail is a little game, mainly aimed at kids, in which you guide Snailly by placing food, collect the letters before Esnail and deliver them, and watch out for carnivorous plants and other nasties.