A pretty original game. The core idea is pretty unique and appealing but I feel like the execution could use more work. 

First, you really want to give the player the controls before starting. Maybe I'm stupid, but it took me several minutes before I understood that I had to move that battery. Just adding a line in your game description would do the trick.

Second, the game is way too slow. I understand that you can't go too fast with such design, but as it is, it's kinda boring, especially for a racing game. Maybe make the tracks larger so we can accelerate longer? Maybe don't make off-roading so punishing? Maybe use some visual tricks to simulate speed? You probably could look at some old Micro Machine games to get some ideas.

And third, the collisions are way too sensitive. And with tracks so narrow, you are doomed to collide with the IA car, especially while you turn. It seems like a detail, but it's really frustrating to lose just because the other car pushed you offroad.

So it's a good start, it has some potential; polish it a bit and it could become a really interesting game!