I really enjoyed playing this. It's simple to learn, the controls and concepts aren't complicated, and it's challenging, but never so much that you feel that the jumps need to be pixel-perfect or that the puzzles have no solutions. It's just enough to keep you trying, no matter how much you fail. I will say that the controls felt a tad slippery, and dropping down took some getting used to, but that didn't heavily detract from the overall experience. The concept feels like it could be expanded into an interesting co-op game, but that's just me thinking. Also, I pretty much never say this about games (which might say something about the games I play), but this was really cute.