Guard
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Basic enemy, armed with Pistol, Uzi, or Rubber Gun. Patrols the halls until Pyre is spotted. Low Health
Soldier
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Upgraded guard, armed with Assault Rifle or Shotgun.
Inferno
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Possessed enemy. Armed with Rocket Launcher or Flamethrower.
Sniper
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Stationary enemy that fires only when you come within it's cone of view.
Guard Dog
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Smells you out in addition to looking around, meaning that you can't get close to it or in front of it. If it sees you, it chases you.
Security Camera
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If it sees you, guard after guard will start pouring out of a nearby door until you destroy the camera.
Sensor Laser
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All enemies in level become aware of you, but guards don't come like with the camera.
Mines
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Same as yours, except they blow YOU up.
Mounted Gun
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Do not appear until another enemy sees you, then they pop out of the walls and fire at you, usually with machine gun, sometimes flamethrower. They will retract into the walls while they reload, therefore they are only vulnerable while shooting you.