I just started playing the original and it's actually pretty fun. I don't think I'll be trying to complete all the challenges though. It's a fun concept, the only thing lacking is in the tacked on motion controls (waggle rather than a button for jump), which makes it harder to control than it should be. I also don't like how the blob sticks to the sides of buildings when trying to jump on top of them, which wouldn't be that big of a deal if everything wasn't timed.