The initial feeling I got when I started this was confusion, because the screen was so busy (filling in the blocks might have helped with that a bit?). But after a couple of seconds, it became pretty obvious, and turned out to be a really interesting take. I love the idea of doing platforming on the notes of a song; it's very clever.
I ended up eventually not really using the antigravity much (though it's a great idea, with it using your score), because it felt like I lost more points trying to get up if I fell with that than if I just fell. This was, perhaps, in part due to it not being immediately obvious how many points you lose when you fall. Showing it above the character like with the antigravity might solve that.
Overall, it was fun and the concept was cool.