"What really makes A City Sleeps interesting is how music "drives player projectiles, enemy spawning, movement, and bullet patterns." Essentially every action you make has a musical accompaniment. Attack, and drums beat. Stop attacking, and the drums stop beating. Enemies follow a musical pattern, which allow you to sometimes anticipate their actions."
We got to show the good folks over at Examiner.com our game and they seemed pretty into it!
http://www.examiner.com/article/hands-on-a-city-sleeps