Nicely polished. Art/music/sfx are all very coherent. Good mix of puzzle and platformer.
Just some nitpicks - character movement feels a little stiff - having some accel/decel in the movement or maybe just some intermediate animations for running/jumping would have made it feel better (for me at least). Jumps are also a touch floaty (although this may be required to make the moving platform mechanic more accessible).
Really excellent entry. Quite impressive.