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)