Look! I added a message!
The boss is pretty much finished, needs textures and some balancing. It has 3 things that it can do. It can shoot a line attack, a diagonal attack, and like any douchebag endgame boss, it can heal!
It is enemy #22 in the hazards array, once spawned, another will never spawn. and nothing will spawn after it, this can be changed quite easily in the GameController script, but I wasn't sure on the general consensus as to what exactly would happen after the boss so this is what I did.

If spawned naturally the boss will not move farther than a certain point on the screen, but if spawned manually the isBoss variable in GameController will need to be set to true.