Overall a well made game. The menu screen is a nice addition as well as hitting any of the grass resets your game. And having the car move up and down was cool. I would say though that some of the green needs to be cleaned up a bit as there are small green lines along the screen. If you want a slightly cleaner look I would consider trying to use tile mapping for your levels instead. It makes it easier to edit and you can easily move things out of the way if it becomes a problem.