Okay, I was drawn by the ridiculous and silly premise. However, in practice, I really enjoyed this game!
The mechanic of using dice as your kart is awesome. I will mention, though, this is a more difficult game to play online on platforms such as Tabletop Sim. So, I would highly recommend you play in the meatspace.
Though, even if you don't feel like the theme works with your style of game, I feel this game's rules can be applied in a wide variety of situations. Right now, I'm thinking of pulling together an Acceleracers-themed campaign for these with some Hot Wheels cars.
Even if all of this doesn't feel like what you want. You can still apply it to your pre-existing campaigns. If there's any sort of vehicle-based chases I have in any of mine, I will use this system.
Well worth $5.