What makes Ace of spades different?

[kmaj]

I smell the foul odor of trolling.

[Sniper101]

Through out first person shooters (FPS) there have been things that distinguish them from other fps games.

Halo-confetti for headshots,veichles,futuristic weapons.

Call of duty-fast paced games,lots of weapons,lvl system




But what makes Ace of spades different from others? (yes im aware you can build and such, which was copied from miecraft, we need something ONLY this game has)

Please post your ideas below.