I added AI behaviors (the art isn't final):

• Blue Shield: Defend - NPC's defend the player and attack the enemy nearest to the player. They will run back to the player if they get to far from them while attacking.
• Red !: Attack - NPC's will attack enemies close to them until they are dead or the enemy is dead. They ignore the player's position
• Green Peace: NPC's don't attack even if they are attacked. They also harvest nodes for resource.

Switch modes with the [0] zero key.