Passage

[txrxs]

At this year's Montreal International Game Summit, the game development collective Kokoromi held their second annual Gamma event, challenging designers and coders to create games under strict guidelines. For this year's event, games had to be a maximum of 256 x 256 pixels, and be fully playable in around five minutes.

Passage:
http://hcsoftware.sourceforge.net/passage/

Give this game a try, it's not what you'd expect, but a compelling piece that borders on art. Play through it a couple times for full effect.