Alright, I can see the foundations developing here
Here are some things I'd like you to make in the full version.
1- Skybox, Where ever I look the sun is always in the centre of the sky.
2- More detailed terrain. If you can't manage to make hills or anything, work on some textures.
3- More road, this kinda fits into the terrain section.
4- another in simmilar workign to terrain - Object such as buildings and trees.
5- The hardest one: Improved physics. When I let go of the up arrow button the car stops instantly. Try to develop a code that will allow it to accelerate and decelerate smoothly.
If you master all of this in your oncomming game then it should be front page material. You've obviously figured out how to make a 3d level. Perhaps a 3d car as well.
I'm not saying that this will be easy. I'm just reccomending it. Good luck.