Construction of a rocket requires massive amounts of resources , motivating the player to set up a sizable , effective factory in order to achieve this goal. The player is concerned with defending themselves and their factory from the planet 's indigenous fauna , who become increasingly more hostile as pollutant emissions created by the player 's factory increase , necessitating consideration of the balance between the player 's production and the enemy 's aggressiveness.
In Factorio , Biters is the indigenous fauna of the planet .