Had to stop at level 13, it was too hard for me. Not a sign of a bad game, it's just me sucking at puzzles.
Nice clean presentation, the music is nice and relaxing and the concept is really fun and interesting. A lot of games have this concept, but being able to rotate the entire level as a cube was really nice.
My only gripes with it were that on rare occasions gravity was wonky and that while freezing the cubes is a great idea, you can freeze them in mid-air. I did 2-3 puzzles not the intended way because of this.
Also, you rotate the cube forwards and backwards and left to right on only one axis. I wish I could have rotated it left/right on the y-axis using Q and E. Would help me get a better view and line up cube drops.
On the whole, a great game!