The game seemed fun, you need more levels perhaps or mabey cretures of zombies. Im a fan of zombie dogs my self, back to the point though, you should add a few things here and there

First off, I'd like to award myself the extreme loser award for spending around 3 hours getting 3822 kills and 2058000 just cause I need to win at something (Zukeriath, top for now).
Anyhow, while i'm on that topic, there needs to be more of a difficulty curve seeing as at 500 zombies it seemed to stop getting harder. Also, i'd reccommend more powerups to spice things up a bit, and all the weps should be equal in power, just in different ways so there can be people can use different ones.
One last thing, the combo system should award more based on actual combos instead of just overall amount, like a 10 combo shouldn't be worth only as much as 5 two combos. Other than that, great game.

it sucked i got not even 1 minute into it and it sucked

well it was fun, but you know i would like maybe an ultimate wepon, a system of levels maybe, flat rate health, and perhaps after 1000 kills you get some cheats like armor of invisibility so zombies don't notice you, those are a few things that could make this really good. and ill give you a 7/10 4/5

Thought quite highly of it. Problem is I got to 1060 kills and after waiting for 3 minutes no zombies were coming.