This is a solid game. Small in scope and just clever enough to be interesting. I played this alone and really enjoyed dividing my attention between the two roads, there's enough obstacles to make it frantic without making it too difficult.
Presentation is clearly the biggest area for improvement. The flickering is an obvious problem and really uncomfortable to look at.
I'd also add that some kind of feedback for your actions would really take things up a notch. Stuff like a visual and sound effect for turning, crashing, starting the game, and whatever else would do wonders to make this game feel as fun as it can be. It'll also avoid issues like when I was sitting there wondering why there were so few obstacles, when in reality I hadn't started the game yet.
While those details would help a lot, all in all, I had fun. Good work!