Beautifully game.
Music, ambient, and visuals. Game mechanics & puzzle are interesting, fun, and with a well tuned difficulty.
I ran into an issue on maybe the 5th level where I was stuck with one blue dotted square, couldn't move much and looked like a gray square.
On the second level I think I got stuck for a while because moving the square doesn't work if you are standing right next to it. And interesting mechanic if on purpose, but maybe consider presenting it in way that it's easier to figure it out.
I really liked this one.
Well done!