I really like this game, although changing to the shape/type I wanted was more difficult than I'd like.
I'm not sure if it's meant to be part of the difficulty, but remembering the order the shapes spawn incorrectly, pressing space one too many times and having to cycle through again was frustrating. It didn't help that the shapeshift wasn't as immediate/responsive as I'd like (though that is probably down to my rickety laptop).
I would've liked some on screen visual representation of the cycle, maybe instead of just showing the current elements all 4 could be shown but the inactive 3 at a lower opacity, I don't know.
That's my only criticism though, as I said I enjoyed this entry.
PS Thanks for checking out my game!
EDIT: I meant to put this on the Ludum Dare page, I'll put it there too. Apologies.