Small note, I noticed the CSS on your "Sign Up" button is calling the Lato font incorrectly. Instead of font-family: Lato-Bold;, it should be font-family: 'Lato', sans-serif; font-weight: 700;. Can't wait to test this out however!
I feel it was a somewhat poor demonstration of the controller. Each demo was set up for a game without, or as if the game did not have, controller support. Games with controller support would make it feel more like a traditional console controller. No idea why did not show that aspect of it.