Quite Lacking
I like the idea you were going for, but the vehicle creation is flawed and frustrating. Vehicles that look like they're attached come apart when put on the track, and there's no way to really gauge whether it'll work until it doesn't. Also, some type of control on the speed would be helpful. Try to bring in elements from games that are all about maneuvering over obstacles would help this a little. Just needs a little improvement here and there and it would be better.