Cool game !
Very short and a bit too easy. (There's a lot you can do with this gameplay mechanism to create interesting puzzles.) but the levels you have are pretty well though and enjoyable to play. (would have enjoyed to play a few more)
The art is simple but coherent and readable.
little feedback : the audio is a bit unbalanced. ( the moving sound is a lot higher than the rest).
All in all, it's a good jam entry. Good work :)