Character customization though active gameplay is my favorite kind of customization! I really like the minimalistic uncluttered view of the game world and simple control scheme. I've never seen a rhythm matching mechanic like this one, I like it a lot! The visuals are really nice with all of the right effects. Obscuring the main character's face works really well for setting the tone! A bit of subtle ambient noise in the room could be a welcome addition, but I don't think this game needs music.
A very fun and memorable experience! I would love to see the game (and the protagonist) expanded even further, excellent work!