Some constructive criticism
8/10 for two reasons, first on the third level, I died because rather than buy the magnum for 75$ I bought the light you had suggested. This made it so I was vastly underpowered. That curve is a bit steep, just wind down the third and fourth levels, let the player get enough money to get a gun capable of handling the wave you send at them. Secondly, there was no running over zombies. One would find it's way ahead of me due to my evasive maneuvering and when I ran into it, it took no damage. They should take damage from getting hit by the front of the truck. That's all, now I'm off to finish it.