Because 10KApart ( http://10k.aneventapart.com/ ) is closed now, and we are all waiting for the results, it is good time to remind my very simple "Stairs to heaven" ( http://10k.aneventapart.com/Entry/36 ) game and explain in details how it was made. 
Details on my blog:
http://michalbe.blogspot.com/2010/09/simple-game-with-html5-canvas-part-1.html
Cheers.