I really like the concept of this and I think it's a really fun interpretation of the jam theme! A couple things I noticed:
*the camera's a bit difficult to work with. maybe make it so that the camera only moves if the mouse cursor is at the top/left/right/bottom of the screen and keep a section of the middle of the screen as a "safe spot" for the cursor to be without any camera movement.
* The car overturning very easily when you're barely moving isn't very realistic, and is kind of a feels bad, especially if something in the terrain caused my to move and it's not something that I actively did myself.
* The inclines/declines of the landscape are hard to read; I didn't actually know that I was on a hill until I moved backwards when I wasn't pressing the gas. Some adjustments to the landscape's design may be able to help this, but I'm not familiar with 3D, so I can't say what exactly could be done to help this out.
All in all, great game, I'd love to see it more fleshed out!