This game is so awesome I'm already addicted features you should consider adding or changing:

More wheel rims. 

Different color system when changing the colour of vehicle, not RGB. 

Manual gearbox? 

Slider pedal for the brakes as the brake power is too big. 

In my opinion the way you drive and steer is a bit wierd, idk how to describe but maybe you could add a camera angle where you steer but the camera directly moves with the car and doesn't show the side of the car?

Keep up the awesome work :))