Imagine, if you will, a game where you and up to 3 of your closest buddies can dive into a hostile planet filled with bugs and mechs that want nothing more than to murder you. Then picture you firing a barrage of lazer accurate bullets straight into the putrid flesh of your enemy, as they scream in anguish and their blood spews everywhere around them, closer to death with each bullet.
....Then one of your jackass friends walks right in the path of your fire and takes a bullet to the head, dying instantly, needing to revive and then landing on you in revenge. This is usually followed by spamming the F button to melee each other around, calling ordinances on each other and forgetting entirely about the actual mission and fousing only on being the last man standing as chaos and explosions rain down around you.
THIS is a grade A brilliant cross platform game. It's ruined my friendships damn near as quickly and easily as any game of UNO ever has. 10/10 would recommend.