Very polished game, and very nice controls! I loved zooming around on the arrows, it made large levels go by faster than in many other puzzle games. One thing that seemed weak was the puzzle designs... many levels were large but very easy, with almost any path I took being a valid solution. I don't mind easy games but having so many solutions felt odd. Also... the colors are great, but it doesn't feel like it matches the theme.
Out of curiosity... When I first started playing, I assumed I was supposed to cover *every* tile. Was that your original idea? I notice the first few levels have the player cover all tiles.