Pretty much everything dan collins said below. It's a bit sluggish, but fit the calmness of the piano track. I got quite far and then died and had to start completely over, which was a bit of a downer. Some kind of checkpoint system would have been great.
As you said, time was the real killer here. A little more haptic feedback (sound effects etc.), maybe a little faster movement, and more than one song and this would have made this so much better.