You control a parrot. You need to push the other parrot out of (or onto) the ring using your microphone (or your mouse, if you don't have a microphone).
Repeatedly hit Space to keep your parrot aloft, and use either A/D or Left/Right to move. Your voice power (the rings coming out of the parrots) are controlled with either your microphone volume or, if Unity doesn't detect one, the left mouse button.
The smoke rings on the title screen are also controlled with your mic. Use that to calibrate your microphone setup.