You might not have played Teeworlds (PC)

Teeworlds is a free multiplayer online game.

Gameplay: Multiplayer, Platformer, Shooter
Imagine Worms(tm). Now make it Real-Time instead of Turn-Based and add in 16 player multiplayer and you got yourself teeworlds. It is an awesome fast paced game to play online with your friends or strangers. There is not much else to say about this game except its super fun to play.

Download the game for free on their website.