Hey dude. Awesome demo. Wanted to be a counter-voice to all the commenters here complaining about having to resize the window to make this work. You've got lots of upvotes so clearly people like your work. The only people commenting are the pessimists.

The resize thing is a cool hack. I wonder if anyone has ever made a game with window resizing as the control mechanism.

Finally, if you do you want to get rid of the resizing, maybe an easy way would be to simulate it by covering the un-animated part of the window with a curtain (Mario style: http://www.flickr.com/photos/shieldsokc/5388817583/).