Loved the industrial environment design. I really like the car model, it has a lot of soul. And great choice putting the timer on the car itself rather than making it a UI HUD element. What if the boost meter was also diagetic? (maybe a step too far lol) Loved the music changes as well. What if the environments changed too :0
At first I wasn't really conscious of which direction was up, but I soon gained a hyper-awareness of when I was on the ceiling after several falls to my death. It's a brilliant bit of risk-reward design because the ceiling is often safer (at least I feel it has fewer obstacles) but you have to use boost to stay on it, so you have less time to move out of the way of the obstacles that are there.
At first I felt it was really janky to hit a box and get misaligned from the pipe, but I learned to love it because it was really cool to recover from spinning out, or just do some crazy fast spins before dying.