Too easy
Dude, the name of the game perfectly fits in it. It is very hard to die in this game because it is so easy... I never spent experience points in stamina and I got to lvl 30 and got tired because it was not challenging.
Please make a sequel with bosses, different weapons, different enemies (not with just different colours), powerups, story, and different lvls, with obstacles and so on... You need to correct the glitches as well.
But the game has also good stuff. I like the gameplay and the blood. I really love the blood.
To finish please explain me something that intrigued me a lot: what are a bunch of people doing tied up in a building with zombies? Don't get it... The zombies tied them up in order to eat them later?