I like the procedural generation idea and it seems like something which is hard to implement. I like how the gameplay loop encourages you to time your turns perfectly to get better times on the lap.
However, I would suggest adding some obstacles or some sort of powerups (maybe a speedboost or holes in the ground) to keep the game interesting.
Some more sounds would also add a lot to the game.
Camera turning might need some work and can feel disorienting.
Overall, a good job and I liked trying to get better at my lap times.