Well done! Music is amazing and I love the idea behind the game. The game feels really polished, especially for a week.
I had a bit of trouble matching the notes sometimes but was able to eventually figure it out. As you said below though, I think giving an option to make the keys at the bottom to light up could make the game more accessible (similar to Ocarina of Time's ocarina mechanic).
Another very minor nitpick is I wish I could move after pressing the note. Maybe I'm a bit impatient but a part of me wanted to start immediately running towards the platform after pressing the music diamond thing instead of having to sit and wait. This might just be me though!
Super impressive work!