Very good game, not the best when it comes to puzzle, but I think I made it to the last level (with all the powerUps), just couldn't figure out the way for that. I had beaten every other level with the "dark" powers though, so must have needed the other ones for that. I did however play on the challenge mode, since I always go to test the hardest first, so maybe I was doing quite good :D
Beautiful art work and music worked well in this. I would have wanted the powerUps to have a small popup that would remind you what they did while you hovered over them for a while, since I forgot pretty much completely what the light powers did, since I just didn't use them at all and in the last level I was just guessing, obviously they pretty much tell themselves, but just an idea.