Hey Althasor - big thanks for detailed feedback, this is awesome. I liked the halo so much that I really wanted to keep it :) But I definitely need to find some use for it..
After confusing it for a shield I thought it might be some sort of power. Like to clear the screen or slow meteors and so I mashed a bunch of buttons to see if anything happened. Considering the music element it could be something intended to be used at certain points in a tune? Hope you find a use for it!