Like every kill-everything-like game
This isnt bad but this isnt the -BEST- massacre game i ever played... The graphic are kinda sucky and there should be more move or more weapon.
Thing you should correct or add:
-Make a "Jump" command
-Remove the freezing after shooting a grenade
-Maybe some kind of lvl you have walk trough the zombies to get to the end
-More upgrade like...1 more life for X score, add more def, add speed, buy weapons.
Good game at all! Keep doing good work dude