It is awesom as it is, but it feels a little bit small. If it were scaled up, the vehicles would feel more like a cart, and there would be more room for speed. Otherwise, this is really cool and different. I love how the ground is actually a night sky texture, it makes it feel like there is no land below you, which is really cool.
I love how the rainbow track has a lot of curves that dip with the turns so you can keep you speed up, and I like how the flat track looks SUPER intense when you drive on it and the color flash by super fast. Keep up the good work!