I couldn't really understand the connection to the theme. If you had done something like having/overlaying two playable regions where one keeps track of the beats for one voice and the second keeps track of the other, I think that would have made more sense to me. Does it happen to have some connection to the two tiles on the leftmost and rightmost sides of the screen? ¯\(°_o)/¯. Still, the visuals were clean, and the mechanics seemed to work. Trying to generate those rectangles dynamically from some given audio file isn't trivial, so I'm not surprised the submission was a bit rushed (though there is probably some Python library to do it).