Awesome game!
1. Well designed puzzle. The mechanic is really easy to understand without many words. Simple control yet challenging levels.
2. Complete user interface. It is quite interesting that many puzzle games I played in this Game Jam are not showing which level I am at, but you certainly got every information I need in your game.
3. I saw many mentioned that the music is a bit repetitive. Instead of creating more patterns or more tracks for the piece, another easy trick is to widen its dynamic range in any audio editing software. I really like the tone of your track and enjoyed the peaceful atmosphere you've created. To me, the track is more like a bit too loud and too flat.
Again, great game!