Goblins are the most common enemy in Solomon's Key.
Goblins walk the length of any platform that they happen to occupy. They turn around and walk back the other way whenever they reach the end of the platform or an obstacle. Before they turn around they try to punch and destroy whatever obstacle happened to be in their way. When they notice that the player is on the same level as them, they rush forward and chase him with an outstretched arm.