As others said I really enjoyed the art. The controls moving around in the maze were also really nice. I felt like I was in water. I would have preferred a more clear exit out of the maze as the first time I went right past that point and had to backtrack.
The puzzle section was more difficult than I was capable of solving. Could be nice to allow for hints, or it places one block for the player after x number of retries. I was sad not to get to experience the final level.