Incredibly original, this is one of the best $20 I've ever spent on a game. The graphics are... odd, but fit well with the theme, the soundtrack is great, and the dialogue is refreshingly bizarre.
Rolling the ball controls very well, using the two analog sticks like "tank controls." The only real hazard in the game is running into something to big to pick up, or getting run into by something too large, so it's a pleasant and fairly low-stress game. Makes it perfect for a quick sessions, and the free-roaming exploration aspects are reasons to replay areas that have already been completed.
I had to call 5 stores in my area before I found a place with one left, so hopefully there will be more copies on the way.