Consider making aliens come in waves

[plexsoup]

The aliens are kinda boring right now. They arrive one at a time and travel straight toward the player.

Consider sending aliens in waves and give them some basic behaviour.

[ItsADogPen]

Monster that combusts into 3 smaller copies when it dies.

[ItsADogPen]

Monster that grabs object flung by player and flings it back
(looks like the object being flung back will need to be registered as being in a state belonging to the enemy to register hits on the player?)