Great game! I enjoyed it, although the spikes from the ceiling before the finish made me return to the start several times.
The character disappears beyond the top of the screen... A strange decision. But it works in terms of gameplay (keeping to the timings and the puzzle element).
There is no key to reduce/increase the size of the character. The need to move the mouse reduces the dynamics.
The atmosphere is gorgeous. The music is perfectly matched to the visual style.