Absolutely, thanks for bringing that up! Interesting to here that about the attacks.
This game really ended up being just "throw a ragdoll around" with guitar sounds and flashing lights. I think the header message I had about "release left shift for shorter movement" probably should have lasted longer, since you can do smaller bursts after releasing the left shift key (the reason I say hold left shift in the beginning is so you can get off the ground faster).
Either way the biggest problem of the game was that the main gameplay loop is just fly at stupid speeds with loud noises. Most of your movement decisions should be made while palm muted, and I did find it fun when moving with palm muted notes, but I kind of made open notes unusable unless you want to move away from the boss super fast.
I could have polished the movement better with more drag, but that's something to figure out for next time