Fun but buggy...

Nice gameplay, but it still has a few bugs:
Transformation: The avatar flickers with every click.
Game Over: The score shown in the box is always zero, regardless of the score in the upper right corner. Highscore submission seems to redirect to a nonexistent url.

I would also appreciate a story and an explanation for what the '2nd form' actually does, since it doesn't seem to have any improvements to me.

But these are just little suggestions. After all it is a nice game and was fun to play.