I have a sore spot for 3D games so I just had to play this!
I think it's a fun game! It could be really great if it got some more polish :)
I think the car turns way too fast, it's hard to control. I think you should make it smoothDamp towards the new rotation instead of what it does now.
Also it would give off a better feeling if there were some environmental sounds aswell as the music. Like normal sounds at a farm. Ambient sounds.
And it's kind of confusing that you can drive through some obstacles, but you lose when you crash into others...
PS: The main screen says "A to steer left, S to steer right" But it's actually "D" to steer right ;)