Pretty interesting game, and nice use of music. The oscilloscope at the start feels like a gimmick, but I guess it was used to test out the input from sound, for latter usage, and also to encompass the idea of using audio as part of a mechanic for later. So yeah nicely done. Also cubes beating cubes, YEAH! All hail savagery!
One thing I want to complain, though, is that when dealing with the raising cubes (the ones that follow the melody), the character often got stuck. Was a problem, especially when they form a staircase, since it was unnecesarily annoying to pass that section, I think.