The game is fun, but not well balanced once you get large enough. I am writing this comment while still playing, because I have 72k health and it's going up even when not moving because enemies just run into me and instantly die. The game has also turned into a slideshow.
I think you could remedy this by having some way to shed parts, maybe once they get hit enough, or making tougher enemies. Once I am this gargantuan there is no challenge.
Very nice game for just 10 days of work!