Obligatory "is that a JoJo reference?"
I very much liked the audio feel of this, and the zoom out at the end was a nice touch.
The first part, where you have to backtrack (opposite of the direction of the arrows even), was counterintuitive for me, but eventually I figured out how to progress.
Clicking on the icons in the top corner gives them "focus". Pressing spacebar triggers whichever icon has focus, possibly changing volume, restarting, or exiting, when the player just wanted to play the most recent chord.