The idea for the game is simple and fine, but the execution needs improvement.
First of all, why a car? This is a very strange environment for a car to be in and so this doesn't appeal to the imagination. It also makes it hard to expand the game, since few elements you can introduce will appeal to said imagination - say you wanted to add unlockable cars... what's the point of collecting them?
Second is the physics. Nothing entertaining is happening while I play, and I've also had platforms blocking me from moving because they weren't spaced far enough apart for the car to pass.
Keep working.

the screen goes really fast.
the level design is terrible.

staring at a wall for a hour is more fun than this.