Haha, that looks great! Short but sweet. Nice squash and stretch you got goin' on there. I guess the only crit I would offer is if you put this on your demo reel, make sure you have some acting animations thrown in there, too. I attended the Animation Mentor "Demo Reel Do's and Don'ts" webinar with Carlos Baena last night, and he kept reiterating the desire studios have for seeing acting and personality in the demo reels, rather than just animation exercises. They want to see the artistry and storytelling ability moreso than the exercise, and the personality behind the animation.
Bleh.. I'm rambling. You probably know all this anyway.

This looks great, dude. Nice job on the rig (that's another thing he said studios like to see; custom rigs.)