That's a pretty cool take on the looping concept. I had a lot of fun, but regardless I still like to make some suggestions:
1. The enemy variety is very low, which means at some point you're just circling the drummer with a huge group following you and there is not much else you need to do
2. The different notes you play (normal / muted / bend) really should have been special attacks! using the mute notes as a slow and the bend as some kind of explosive note would have added a ton of spice to the gameplay
3. Some tooltips showed up for a split second that I could not read but it seemed useful to know...
4. The drumming track felt a bit stiff
All in all, great submission!