Done for at UCLA for our interactive animation class. Mostly just playing with code to load external swf files. It's a "game" only in that the viewer controls when a new animation begins playing. So listen to the music and try to time your clicks to the beat! Maybe you'll get a cool result.

Edit: Sorry, I think I put it into the wrong category when I uploaded it last night. I mean, it has interactivity, but it really isn't a "game". Though it does require user input to play. This is probably a better category to put it in.