To anyone wanting to play this: you have to press "enter" when the box touches the blue edges. The game's vision can be seen the best in the "prototype" level. "Level 1" and "Dummy" are incomplete.
To the game creator: I liked the music of the title screen, and I think the core idea of a rhythm desktop would be very cool! I encourage you to keep developing it, I'd love to see a full version :)