Enemies

There are a number of types of enemies.

Humans
All Humans corpses may raise as a Zombie if the Your Soul is Mine! upgrade is purchased.

Civilians
Civilians may have differing skin tones and clothing colours. These have no mechanical effect.

Civilian

 * First appear level 1.
 * Melee attack. Damage scales slowly with level.
 * Health begins at 50, 60, then 70. At level 4 is 80 and scales at 10x Damage.
 * Only a threat if significantly outnumbering zombies.
 * Can flee when confronted by just one zombie.

Flaming Torch Civilian

 * First appear level 11.
 * Melee attack. Damage scales slowly with level.
 * Health begins at 200 and scales at 10x Damage.
 * Can set zombies on fire.
 * May flee when encountering a zombie. Flees when significantly outnumbered by zombies

Medic

 * First appear level 18.
 * Melee attack. Damage scales slowly with level.
 * Health begins at 600 and scales at 10x Damage the same as any Civilian.
 * May be recognized by their white mask and light blue clothing.
 * Heals and cures Humans and Dogs in an area surrounding them. Units being healed have Heal.png periodically float above their heads.
 * May flee when encountering a zombie.
 * Always dark skin tone, not sure if intended May flee without exclamation mark, though at one point they do have the mark appear.

Police

 * First appear level 3.
 * Ranged attack. Damage scales with level.
 * Health begins at 77 (Civilians are at 70 Health at this level) and scales at 10x Damage.
 * Will move into range to engage nearby zombies.
 * May call for backup from other Police in a wider area. Never flees

Army

 * First appear level 11.
 * Rapid ranged attack. Damage scales rapidly with level.
 * Health begins at 240 (Civilians are at 200 Health, Police at 220 Health at this level) and scales at 10x damage.
 * Will move into range to engage nearby zombies.
 * May use a laser to call in an airstrike.
 * At some point they begin throwing grenades. Never flees

There are so far three different military units. The one shown in the picture with a pistol (three white shots at a time + laser), one with a shoulder held grey grenade launcher (one yellow grenade at a time + laser) and one with a two-handed LMG (rapid fire white shots + laser).

Dog

 * First appear level 20.
 * Melee attack.
 * Have a Police unit they spawn with that they will initially follow.
 * Fast moving. Will charge when near zombie.
 * Will move into range to engage nearby zombies.
 * Corpse may raise as a Zombdog if the Your Soul is Mine! upgrade is purchased.
 * Corpse may raise as a GigaZombDog.
 * Never flees

Tank

 * First appear level 50.
 * Ranged attack.
 * High damage and health.
 * Exclusive to Boss levels.
 * Can not be zombified, are destroyed instead. Never flees

Fleeing unit behaviour
When an unit is outnumbered by zombies they have an exclamation mark flash on their head and leave the building they are in to move to another one. Strangely enough when an fleeing unit reaches the building they run to they may be fight the same group of zombies but can be triggered to run away again.