Once I realized that this was a Cookie Clicker-esque game, I had a good time unlocking everything. You unlock everything pretty quickly, so it would have been nice if there was more to buy. Maybe you could upgrade the cars individually (would have been nice to improve the cannon's handling), or maybe you could buy mini-cars that auto-complete loops for you (ala auto-clickers in Cookie Clicker).
Had some issues with the unlocking process. Sometimes, I would have enough loops but not be able to unlock the next car without going in and out of the car menu a couple of times. Also, the car menu UI never updated to show that I owned any of the new cars.
Not having the track's art represent where the actual walls were was pretty jarring. It's kind of nice that you have more room to turn than you think you do, but the track's space should be represented accurately by the art. It's also awkward that the car starts next to the lap line at a parallel angle. The drift never seemed that useful, even with cars that have bad handling.