Wow
This is the best zombie game i have ever played on Newgrounds... there is nothing on this site that can beat it... it is amazing!
What i found worked was, that as soon as you got the UMP use that untill you get the Uzi... after that also use the Hunting rifle and AK 47, dont use the M4 type weapon. It honestly sucks... see how long you can survive, once you get the AK just repair and look for survivors. unless the Barrier is 90% or lower dont bother reparing it... just look for weapons and Surviors. after you get all the weapons, Heal the barricade and get searching for surviours even if you are at full.