Such a unique take on the theme. But it reminded me of why I quit music...
There's a fairly high amount of polish in the jam game. Some feedback though would be that the game play was a little awakened when releasing the other note. like it felt like there was a little bit too much of a pause and made me doubt what I was meant to do.
But other than that you have a very solid game on your hands, would be interested in seeing how this idea could be expanded on and if maybe other musical elements could be added like some rhythm parts.