Cool theme, I like that the playhead is coming to erase you. Maybe would be better if instead of scoring based on "loops" it was based on "deaths", so you are rewarded for avoiding the playhead by running to the right. I found the platforming a bit annoying and stiff (the controls of WASD+Space are hard to use for a platformer; arrow keys or controller support would be appreciated).
I don't usually self-promote in these comments but you might want to check out my game, which had a similar theme of building up musical instruments through successive loops.