The game plays mostly like Rez with the controller. You want to use the Kinect though. It's funny because I was hesitant to get one since there was a lot of latency issues with demo kiosks. When I got it home, the latency is much, much lower. I had no idea that the Kinect's response time is entirely dependent upon your environment, and the software itself. Child of Eden handles Kinect better than the Xbox's dashboard does!
I have only one gripe with the game, and that's the presence of enemy bullets that can hit you offscreen. On Rez, what you see onscreen is what you have to deal with. With this game, you have to ride the edges of the screen to move the camera a bit further, and so your area of concern is larger. Any time I've gotten hit by something, it was not onscreen, which can sometimes be annoying.
Minor nitpick for what is an incredible game. It's major sensory overload.