Corbital (2011)

Corbital is an iPad app in which you construct a sample-based musical instrument based on your survival strategy in a bullet-hell style arcade shooter game. I developed it as a final project for Mobile Music at Stanford. It incorporates elements of audio processing and cloud-based social interaction, as well as accelerometer-based controls.

From the original project description:

You control the core in the center of the screen, and the goal is to defend the core. Tilt the device to rotate the core. Touch the screen anywhere to shoot. Objects in the game will mimic sounds picked up by the microphone of the device. Furthermore, if you make enough noise, enemies will gravitate toward the core and stick to it, becoming part of its outer defense and playing sound in time with the core. The longer the game lasts, the more volume it demands from you to build up your defenses, so be prepared to make a scene.

Certain enemies in the game do not adopt sounds from your microphone; rather, they download sounds from another instance of Corbital somewhere else in the world. In turn, while you play, Corbital will intermittently send pieces of your core (and their sound files) to other copies of Corbital in the world.

The app is not currently available for download, as I never went through the final iteration needed to package and ship it. You can look at the screenshots though.