In games where you manage a colony or a physics-based base, resource management is key.
Excavate farms in the soil layer for a sustainable food source. In games where you manage a colony or
: Swap expensive armor for cheaper sandbags or wood structures where possible to save resources for critical tech like wind turbines or mines. In games where you manage a colony or
: This is your most vulnerable point. Strengthen it with outer and inner gates to create a "kill zone". In games where you manage a colony or
Build a "Great Seal" (a fortified entrance) that stays closed except for migrants.