Needs a little more variety - (defense, jumping, specials, etc.) and you should include some sort of strafe and ammo for the guns. .
If we're supposed to kill a crazyness of monsters, why do they drain us half our life each? 3 shotgun shots would be more enough to snatch the head out of the zombie, in fact, one near shots disintegrates it. Realism is still required, even in fictional games like that.
could be inproved
the zombies move to fast, and the main charector moves to slow. sides that looked good
it's not the worst game but its not the best.
too hard man... you die soo quickly.. change the health and attack power of the enemies