I've added Boss2. Its power is to drop Enemy Mine prefabs, but with different logic than the randomly appearing Mines during waves. These Mines start visible and can be shot with a particular bullet (Durable Bullet) to change their direction. Boss2 can only be killed by redirecting mines to collide with it.
This video is part of my ArcShoot video game development series in Unity3D. To follow daily progress, visit strategerygames.com/brettsgamedev. For other game news, visit strategerygames.com.