I really like this idea! I don't like how difficult it is to drive though... I feel like I keep getting into situations where I either don't press anything and I'll crash into one wall, but if I do press press a button - even just tapping it - I'll spin out and crash into the other wall. And once you crash, you get stuck in a loop of going back and forth, where the only solution is to backout and just drive the whole course in reverse!
The visuals are great though, I really love the little hamsters. I like the UI for the mission info screen or whatever. I also think it's really cool how the tracks wind up and over themselves like in mario kart 8!