Super cool game! It was challenging, but the colored visual feedback was presented in a way that made me keep trying to hone down the proper rhythm (finally got to the second monster after a bunch of tries :P). I particularly enjoyed how the sound waves had a little interference effect when they collided with each other.

This was a very interesting take on a rhythm game and the creatures are cool looking. I'm also a fan of the parallax background, which really sold the illusion of movement. I did find the game to be pretty difficult, but I also have next to no rhythm. Fantastic work everyone!