Pretty Fun
It was pretty fun and it was very addictive. 20 levels was just the right length, but after a while the levels started to seem a little repetitive. It was just all over the place and there was no real pattern to those later levels. I stopped bothering to get a gold star after about Level 10, because it seemed pointless, and it's a little too easy to just pass the level without a gold star.
Still though, pretty good game.