This game is underappreciated, it's fun and has a great art style. I enjoyed the headlights on the car, it was a nice touch. I did find an oversight where traveling down the road on the dotted line would make the car pretty-much unstoppable.
If you want to improve, i suggest making the other cars change lane or introduce a drunk driver car that tries to crash into the player to switch up game play more. Turning felt kinda tight, I suggest adding some conservation of momentum stuff to make the car feel more slippery when making quick turns. You could also add in weather considerations like fog where you can only see headlights. Snow or rain that makes the road more slippery. Maybe places where the road narrows or expands to create more opportunity or to restrict movement. Lastly you could add in collectibles on the road for bonus millage, creating a nice risk/reward system.
Overall fun game! If you have a chance, check out mine: https://itch.io/jam/gmtk-2020/rate/69482