Nice one, here is my, hopefully helpful criticism:
- the sound and music are not great, they don't fit with the game (may be personal opinion based on taste)
- the puzzles may be a bit too easy if you are not always trying to get the smaller number of moves
- the puzzles seam a bit to similar after you completed a few, maybe it would be nice to add a secondary mechanic to spice things up, or change art style here and there
- I could really use an undo key, so I could try something out without having to restart
And that's that.