A very beautiful game, amazing color choices. I wish the first few levels were less easy because they got boring with the same mechanics really quick. The later levels are pretty neat but a bit too long for my taste. So they need a bit of difficulty balancing.
The movement is a bit slow too, since you can only press a movement key until the moving animation is completely done, so even if visually it looks done. In the code it still doesn't (I believe because the animation has too much ease out). So it's quite frustrating to have your inputs missed.