Very cool game! I really like the pixel art and the driving mechanics. The driving feels really good.
I would probably change the scale of the opponent tracker (do not know how to call it, I mean the thing on the right :D) a bit. At the moment you see there very late when you are close to overtake an opponent. Often you can already see the opponent on the road. I would make that the tracker on the right so that you first see there when you are closing up to an opponent and only when you are roughly 1 - 2 lines away from him you are close enough to see the opponent on the road. Additionally, at the moment there is also no goal, but I assume this is "work in progress". Based on the timer I think a cool goal of the game would be to overtake all opponents within the given time.
Overall this is already a very cool experience. Keep it up!