Great game! I'm pretty bad at driving games, so I found it quite hard :D. I really enjoyed the concept, I like the idea a lot! It's also nice to have some destructables like the boxes and trees.
I can see why there is the time limit and why it's going down. I didn't like it though, it was stressful. I'm thinking that if you drive slowly and unefficiently, you'll have a bad time dodging that car later - that's what I'd like to see developed more. I had a fun time nonetheless :). Very well done!