Hard game! Really like the music theming, mixolydian mode was actually one of the first things that came to mind when I heard the theme that I didn't end up using. I like that the weapons and enemies all feel well fit to their musical meaning too. The slow tanky whole notes, the fast 8th notes (both the enemy and the weapon), it all feels right.
Would love to play a slightly rebalanced version that's a little more forgiving, right now I have to drop everything to take out any 8th notes as they just laser in on me. Overall great job!