Enjoyed the music and environment design. I'm terrible when it comes to rhythm games, however, and couldn't really keep track of the towers I placed versus the three different rhythms I needed to control with them, so was slaughtered in the first wave. For UX, it's probably a good idea to start off with an easy level (IE: only one rhythm) to onboard the player. Otherwise, I feel Keep the Beat is a cool concept to innovate on the tower defense genre with a stylish aesthetic and sound.