Planetary Reclamation

In a planet, a few centuries after a cataclismic event that caused humanity's advanced technology to become a thing of the past, now faces another bigger threat: "alien" lifeforms are invading and setting their tools in order to terraform it, rendering it unsurvivable to humans. 

Now its up to a rebel group, known to the humans as 'Fireflies' to eliminate the different outposts setup by the "alien" lifeforms, and rid the planet of their kind, so that it can evolve back to modern times.