I like it! I had to play alone, but the aesthetic is cute and the level designs were fun. Just a couple notes:
- A quick fade between the dark and light backgrounds would make it easier on the eyes
- At one point I ended up with the red circle on top of the green circle and wondered if I could use that to jump higher, but the red circle couldn't jump at that point. I think it might lead to some interesting puzzle designs, but it would probably also require changing existing puzzles, so I dunno, just a thought :)