You are playing Dead Switch
Like arena photographers, like gunning lower opponents without particular reason, if that's the case then you've come right place. Do whatever needs doing to gun lower every single enemy you discover may it be a survival game or just an arena team dying match style game. Be looking for bigger and more powerful guns along with the bigger then gun he more damage you is going to do towards the opponents.
How to play:
Make use of the mouse and also the keyboard for those controls in game.