Dear Sir/Madam,
Firstly, love what you have done with the game so far!
I have some suggestions I'd like to make regarding the game:
(1) I know vehicles are coming, though introducing something simple like a bicycle could improve the current state of the game tremendously (so much time spent running).
(2) If weapons could decapitate/dismember zombies.
(3) Changing weather
(4) Resolve the zombies glitching through doors, walls and floors.
(5) Some lampposts now give light though it does not come from the bulb (unrealistic, the light just appears underneath.
(6)Use-able bayonet as opposed to merely cosmetic.
(7)Horse-mask masks? You have clown masks why not implement horse masks (current internet sensation) :)
(8)Different levels of moonlight lighting (not sure if this exists already)
(9)Option to pull bodies (would be useful to pull friends out of dangerous places if they are unconscious/dead and or to pull enemies you killed to an area you can safely loot them).