I love'd chip's challenge, and I think this theme is brilliant!
The panda itself looks slightly scary, though. I think it is the proportions and the eye position. It's not super-deformed, or compact and cuddly, and it hasn't got puppy eyes... I don't know... something about it makes me feel uneasy. Like one of those Japanese teddy bears which have blood and claws when you look closely.
There is an open source clone out there somewhere, though with terrible graphics... but perhaps you can borrow it's levels database? Just a thought.
Oh, and if you do create this, please consider an OS X port? Pretty please?

EDIT: Snap, I just noticed "mobile"... ok, I have a J2ME phone, so I'm game (though it's 320x240 actually).