The float-iness paired with the music actually made this feel like a fun little challenge. Would probably be good to mention the controls in some way though, took me a couple of minutes to realize how as I tried for clicking in random space, wasd, then arrow keys. I'm not sure what made me even think to click and drag the circle.
I enjoyed it! Made it to score 200 then got a game over, didn't think I hit anything, so I assume that was the end.