Shadows

You wake up in an underground arena, only to be met with portals spawning clones of yourself who are trying to kill you! Navigate various levels while you shoot evil clones of yourself of varying difficulties. In order to escape each level, you must kill at least 50 clones. After doing so, the portal to the next level will spawn. You have shields and health, although, you should tread lightly, as there is no way to regenerate health once the level has started!