In a world with no light or power only you can bring it back. As the last "human" you must fight for your kind. You must take back the power from the robots who stole it from the humans. Activate all five pylons to activate the EMP and destroy all of the robots. Your ammo and health are both linked by your charge. If you shoot a bullet your health goes down and if you get hit your ammo goes down. I ran out of time and did not get done with the ending (very disappointing), so instead I will just say what the ending was meant to be.

Stop reading here if you do not what to know.

  You were a robot who had your memory wiped by blackout protocol by the last human right after you killed him. Blackout protocol had the goal of destroying all of the robots and when it wiped your memory you forgot you were a robot. At the end with the EMP in the middle when you walk up and activate it, and when you do it ends up doing its job. Little did you know you were actually one of the robots so you ended up killing yourself in the process. The humans that you were trying to save were long past gone so all of what you did was completely worthless.