Human Body Defense Prototype

I've been assigned to the team, Human Body Defense, a top-down shooter where you must destroy various diseases to heal the body. Our prototype will focus on the main mechanic, using your enemies abilities to adapt to your environment. This means that when you destroy an enemy, you gain some of their ability such as partial immunity to their attacks as well as their weapon to upgrade your own. Thus far, we've programmed a player and an enemy that can shoot at each other, move around and die. Since A.I. is my favorite thing, I took the responsibility of implementing basic enemy behavior. Mostly stalking behavior and correcting course change every 1/2 second while firing every second. The enemy also stalks the player meaning that it will follow the player up until a min distance plus some epsilon. If it is within that min distance, then the enemy will retreat back while firing at the player. Obviously this isn't very exciting, but it does show the concept of an enemy that will attack the player, and when it dies it will drop its weapon for the player to take and adapt to.