Two ideas:
A Leaf in the Wind
Use your body to control the wind, blow a leaf to a place. The middle of a pond, on top of someone’s head, onto another pile of leaves. Kinect controlled. Something like Flower but with your body as a control.
Moonsong
Use your body to control tides/waves. Help rescue people that stray too far out, or drown them. Wash up broken bottles and see who finds them. Help a beached whale or let it die.
I could also work on my Cerberus game.