This is great. Easy to pick up and really fun to play.
Sometimes the game would freeze for a second or two upon killing an enemy. Maybe that's just because I was playing in my browser.
As you get larger, the camera zooms out, which is nice. But if you take damage and lose part of your body, the camera doesn't zoom back in. This means it'll be REALLY zoomed out once you start getting larger again.
Very well done. Good job with this.