This game looks really good - especially for your first ever jam, that's really impressive! This is also my first game jam, so I get that it's pretty hard. Anyway, some suggestions:
- The UI is good, it allows you to select different levels
- You didn't seem to include any type of instructions. For someone who's played games before it isn't too difficult to pick up, but that might not be the same for someone who's never gamed before
- I didn't really find any way to "lose" at all, whether I hit a car in the parking lot, a car driving, or a cone. If you wanted to implement this you could use SceneManager to load the exit menu when you collide with a car or cone with OnCollisionEnter()
- The music gave it a nice feel, but it would have been even better if you had some SFX or VFX (like particles) for when you hit something, drove around, or finished the level.
Regardless of all that, this is really impressive, even for your first jam and with only like 2 days. I know how difficult it can be to make a game with that short of a time limit, so you did great! I'm sure you would have implemented all these and more if you had the time, so well done!