Hi! I've just recently received my DevKit so I wanted to try and write a simple game just to try my hands at it:
I've recreated Chrome's (in?)famous dino side-scroller running-man-style dino jumper. It's just a quick hack, certainly unfinished and unoptimized but you might enjoy it.
Code is up at GitHub, if you like it you might want to tweet it, and here is a small demo if the above got you curious: