"Enemy" refers to a person, group, or thing that is against or opposes another person, group, or thing. It is someone or something that is seen as a threat or causes harm. Full definition
The game's story unfolds across 10 unique levels, but each level has six waves of enemies of varying degree of difficulty in order to keep the player on their toes. (nintendotoday.com)
Unlike those types of enemies in traditional shooters, body shots aren't enough to kill them. (kotaku.com)
The screen can fill up quickly with enemies with each kind moving in their own way. (gertlushgaming.co.uk)