"Enemy types" refers to different categories or kinds of enemies. It suggests that not all enemies are the same and can vary in their abilities, characteristics, or behavior. Full definition
I also decided what enemies would appear in each shot; I wanted to show as wide a variety of enemy types as possible. (derek-lieu.com)
It was when the development team revealed all the different enemy types in the pre hands - on presentation that it started to dawn on me that this was going to be something special. (vg247.com)
A few new characters, three enemy types in all levels and very limited maps. (toucharcade.com)