A really interesting take on the theme (though you have to admit, it's a bit of a stretch to say it's rewinding back).
I don't really have any suggestions, other than maybe making an easy mode? And also maybe removing parts where you need to press all arrows? It was really hard for me and I found it hard to feel the music with the presses because of stressing out a bit to catch all the arrows.
Also, I want to thank you for putting fur Elise here, it's really nice. And of course, I failed miserably when trying to play it with the arrow keys, the same way I failed when I tried to play it on the piano. But had a lot of fun nonetheless.
Anyways, really good and unique game!