Music is way too loud, even of only one notch on my speaker. Volume/mute options would be great, and max volume should be about 75% of what it is currently.
No in-game instructions. I found that WASD controls the car and space brakes awkwardly. So there's no reason to use it. Opponents car is same speed but better acceleration off the line, so I'm not sure it's even possible to win the first race.
(Nevermind, I found the shortcut on my fourth playthrough. But odd controls caused me to crash into (and fall through) walls and I lost anyway.
I barely managed to win on my 5th try.
The controls could use a lot of work. Minor table wind up with exaggerated movements. Slight bumps seem to glitch the car out.
Mouse for menus and keyboard for in-game is tedious, you should probably just have keyboards for everything.
The garage doesn't seem to have a purpose now, I think you'd planned something, but that time probably would have been better spent on polishing the core gameplay.