Well like I said, the tech is nice, and its functional, but I don't really see the benefit for gaming other than clones of the ball slapping game using different objects and backgrounds.
Maybe a "You Think You Can Dance" game where you have to match dance moves made by onscreen characters by doing them for real, or an American Idol/karaoke game where you have to sing and put on a performance at the same time.
or how about Patty Cake the video game, where you learn thing like;
"Patty Cake, Patty Cake, Bakers Mam, Bake me a Cake as fast as you can"
or
"Miss Mary Black, Black, Black, all dressed in Black, Black, Black, with silver buttons, buttons, buttons, all down her back, back, back."
How about jump rope simulation. Now you'll finally be able to literally "Jump In"!
You could learn basic jump rope, or even competitive Double Dutch!!!
really the possibilities are infinite