Really really good. I loved how each shape not only had their own unique ability but their own useful properties such as size or how they carry others. I especially loved how open ended the last level is. I also liked the glow effects and the post processing in the game. My one and only note is that the keys that you use could change, since I felt switching characters was on a uncomfortable key position in proportion of how much you use it. Still I loved it and I would enjoy seeing the idea be expanded.