Whack-A-Vole

I’ve been comissioned to design a vole character for an animated “Whack-a-Mole” type game. Problem is, voles are extremely cute, and who wants to whack a cute character? So I started playing around with abstracted shapes to hopefully give him a little more attitude. Not sure if it worked. This is my progression of sketches. Feel free to post a comment and let me know what you think, I’d appraciate it.
(Click for a larger image)