Mirror Mode in Spaceflux reflects the level so each player has a copy on the opposite side. You can eliminate an opponent by shooting either of their two copies. Unlike other modes with infinite repetitions, Mirror Mode creates only two copies, making the narrow map twice as crowded and more hardcore.
That's my reflection! He does everything I do. Look, I'm hitting myself. In mirror mode, the level is reflected and players have a copy of themselves on the other side. Shoot either copy of your opponent to kill them. Mirror mode is not infinite like the other modes, but it's one of my favorites since having 2 copies of each player on this narrow map makes it feel twice as crowded and hardcore. So yeah, whereas other modes have infinite copies of the map, this one only has 2.
