Some things you might want to improve:
- Maybe make the car move at a constant speed? The fact that you can just slow down/stop the car makes the game very easy
- The low-res background gives the game a very cheap feeling, maybe use a better HDRI/model some 3d buildings and put them in the background
- I think it would be more engaging if the camera moved left/right a little bit depending on where the car is going
- Textures/sound obviously