"please comment on how it could be improved."
Here are a few points that I feel should be improved:
> Car controls feel abnormal. That isn't good in a game like this. These should be optimized and should be your #1 priority to prefect this before finishing your game. I can't stress that enough.
> The music at the start is quite generic and low quality, and on top of that it doesn't loop. I would suggest getting different music. Also, the second music doesn't loop at all.
> There isn't really any challange, besides the danger of running into the occasional car or two. All you have to do is get to the green arrow, which occasionally doesn't work (if you drive into the arrow nothing happens).
> Hit boxes feel weird, I was driving by a green car and it said I crashed. Hit boxes seem abnormally large.
> Graphics could be better, static images like that don't give that much of a feel for a game. Rotating tires would make the game seem faster.
I rated 5/10 because it is still unfinished, however if you were to release the game with it still looking like this I would most certainly rate it a zero.
I hope I helped.