That was cool! The mechanics are intuitive and great fun to use. I'm impressed with the puzzle design in the second level; it utilized the mechanics well. I also like the downbeat, atmospheric style.
Good job on the volume settings! However, at the default volume level, the sound effects are a little loud, consistently peaking the audio above +0.0 dB when stacked on top of each other.
All-in-all, great work!