Entities

There are four types of entities in the game: Friendly, passive, neutral, and hostile. 

Friendly

Friendly Entities include any entity that is beneficial to the player including the player themselves.

Player		Try not to end up dead on the floor like this fellow.
SpiderBot	SpiderBot fighting to protect the CPH.	SpiderBot is your bodyguard who will fight the threat on the surface.
ARTHER		Your companion and backup power source.

Passive

Passive Entities will not attack the player.

Mynock		Steals resources from conveyors.
HiveMind		Produces Mynocks. Drops useful material if killed.
Overmind		Sends out waves of enemies. Main bosses to defeat.
Cryoplasm Spawner		Part of the Frozen Factory DLC

Neutral

These mobs will not attack the player unless they are attacked, whether by player or turret.

Slime		No special traits. Good way to get early game organic materials.
CamoBot	CamoBot in camo mode CamoBot attacking the player	Hides if the player is looking at it. Steals power from power storages.

Hostile

Hostile Entities will either directly attack the player, Central Processing Hub, or other machines. The hostile entities in the game represent the main enemy that the player has to worry about.

Wasps		Basic enemy that attacks CPH. Starts appearing around 100 threat.
Heavies		Medium enemy that attacks CPH. Starts appearing around 1,600 threat.
Bosses		Strongest enemy that attacks CPH. Starts appearing around 6,000 threat.
Tunnel Nuker		"Digs" its way to you, but leaves trails of soft resin and sometimes organic rock. Doesn't hurt the player directly.
Worm Boss		Deadly enemy that will spawn on top of soft resin. Has acid spit that will damage you. Causes near instant death on collision.
Lava Worm		Spawns on magma.