Wow. This is pretty unconventional, you fit the theme really well. I had a lot of fun playing this, its fairly challenging, but I got the hang of it after around 10 mins, and got my first win.
The triggers are a little hard to hit as you have to time it slightly early, and they arnt very forgiving. You nailed the gameplay though, I was very plesently surprised with how fun it actually is. You have a really good gameplay loop, I'd like to see/play more levels (and songs) with this gameplay.
5/5 for sound for sure, I was jamming out to the music. 5/5 for fun as well. I could see this being a finalist.
-Yaniv