6. Alert mode, require 5 AP (can be use by player or enemy). Automatically fire primary weapon, Trigger if target in weapon sight.
7. Fog of war, in several stage, player can't see target (zombie or rebellion) in building except there is at least 1 army on that building.
8. Armor, leaf cloth. Unseen (if there is more than 1 army on enemy sight this unit is not targeted or enemy accuracy -20% on this target)
9. Mutant Zombie, Larger HP but slow move or faster move and deal heavy hit.
10. Leveling system. Get exp for every target killed. Can upgrade health, accuracy and skill (example suggestion no 6)
Concept Suggestion:
1. Infection: Zombie has ??% change/attack that can infected target (player or AI). Infected target decrease his health by ??/turn. If target die by infection, it will rise again as zombie in 2 turn. Can be cure by item.
2. Weapon: Rocket Launcer, long range deal area damage 1 ammo/slot. AP-2.
3. Drop able ammo, enemy has change drop his ammo by ??%.
4. Primary and secondary weapon. I thing, melee weapon is not useful in late game. It'll be good if player can have 2 weapon at a time. So if the ammo of primary weapon empty, u can still use weapon if secondary weapon while searching for ammo.
5. Player can drop his ammo.
 "Renegades"){kind=icon}
Ha ha! Nice thought about infection mechanics! Would give some more variety and fun.