Hello,
About this:
2. A list of extra items you'd appreciate. For Zombies, Survivors, Humans, Nemesis, Assassins and Snipers.
I have some suggestions:
Shop:
-HUMANS-
Knives [Multi-Jump / Extra-DMG / Speed] (For humans)
Special armors [100 AP / 150 AP / 200 AP / ETC.]
No Recoil
Multi Jump
Special guns [ M5 Two Hands / Grenade trower / Fire trower]
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Special classes for humans with different kits
Sniper - AWP/DGL/Grenades/Armor
Gunner - Choose primary weapon/DGL/Grenades/Armor
Medic - Can heal/DGL/Armor] / Like classes for zombies.
This is all for now.I'll post later another suggestions.Good luck.