I thought this game was good of its kind. It mostly works because it's standard shoot em up zombie goodness. What I did find strange was how it just seemed to have a silly premise. I understand protecting things in a defense game, but this was also rebuilding your car. I thought it automatically did the work as you were fighting the zombies, but it didn't. It seems to take too long to reload.
It would have also been nice if there was some music in it. It's still a fairly solid game as the good outweighs the bad. What I appreciated was how the zombies didn't come directly after the car unless you were on top of it. Too bad you can't repair it while defending it. Still good for a zombie game.