Presenting Canabalt: an awesome single button game. Jump to scape from a collapsing city. On the background, see big creatures destroy the city.

Dice Wars: Turn-based strategy game, using dice and a randomly generated territory map. Similar to Risk but simpler.

Captain Forever: Destroy other ships and improve your own with their parts.

Luftrauser: This is a nice and minimalistic airplane combat game created by Rami Ismail and Jan Willem Nijman. The goal is to survive as long as possible against endless attacks of airplanes and battleships. Atari 2600 veterans would definitely enjoy it.

Pipe Riders: A simple design but fun to play and a good way to train your reflexes.