Very good, the only drawback is no save feature. Kind of makes me want to just give up after the easy achievement instead of continuing, since I'll never have enough time to beat all the levels in one sitting. 4/5
@Waffles911: I just beat level 9: you have to get the birds. (orange = time, green = don't use double jump, pink = don't kill pink creatures) that's about as much as I know about them so far. But seriously, this game is awesome. 5/5