Firstly, because it controls a little differently. But, more importantly, because of the player's character, and the game's setting.

You're not a space marine. Or a US Marine. Or a cyborg, bounty hunter or cowboy. You're...a balding old British geezer, a crackpot alien invasion nut who has the last laugh when aliens invade and start eating everybody's face off.

Note also the alien's resemblance to a certain other Ubisoft franchise, one synonymous with Nintendo consoles...

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter

Killer Freaks From Outer Space Isn't Your Average Shooter