Really fun concept! Impressed you got it in 3D too!
What I liked:
The little bit of story that you included was captivating! All you have as a weapon was a space rover and you gotta run these aliens over with it. Love it. The mini-map was an awesome touch as well.
My thoughts:
I think the car was slow. Unless I'm doing something wrong I could barely turn the car around before the aliens killed all the domes. I'd speed it up quite a bit!
Overall, awesome submission!