This is a good concept, but there are several things I need to point out here.
First, this is NOT a rhythm game by any means. Your moves do not align with the music, and in fact, I find I did better with the game muted. If you make a sequel of sorts, you should either have no music, or have generative music that reacts to your moves.
Second, as this is a pure reflex game, I prefer there to be as few distractions as possible. The line that shoots out from your box is a helpful touch, but the background graphics often distract my eyes. If you make a sequel, please give us the option to turn that off too.
Third, the color scheme is distracting as well. The red box and cube are too bright, and jar in comparison to the blue background. It'd be a nice touch for a sequel if you gave us the option to choose those colors.
Also, I got 75.