Here's some suggestions that I thought of :
//Some bugs :
-Sometimes the zombie hits u twice in 1 hit, it always happens to me and I always do it to others, from 165 to infected in one hit not just from 165 to 0
-Knife blink glitch can occur when the zombie is stuck below a human and he easily can infect him, it is recreated by holding Right click while the human is on air
-Sometimes when ur 1st ZM, and someone connects, it makes u unable to buy BOSS
//Qualit of life :
-reduce the music volume of Boss/ Survivor rounds or atleast make the option to disable them, man are they loud, my ear drums hate me bcz of them
-Make slots able to take AFKs spots when the server is full
-Refund the money spent if u get 1st ZM
//Gameplay :
-When u get frozen make it that Zombie madness can unfreeze you,
-The plasma gun has became the meta and its super boring, I think it should be nerfed by either : player cap, like other high tier guns, or lower damage
-I know that the chainsaw is nerfed, but I think its level should be raised or the armor cap should be lowered to 350-300
- I know the milkor got nerfed, but I think it should be buffed again, maybe faster reload time
-To incentivise new players to stay on the server, maybe make knives level bases, so that the axe knife maybe requires 30 LVL
