Sure I and many of us someday will wonder when will this game called MewnBase be a Co-operation game and will ther be any hazards like weather and possibly "aliens"
For semi-passive aliens, how about nocturnal gribblies?
They would sneak up and nibble on your stuff (a cause for the air leaks in the next version?), but could be kept at bay using your flashlight or by building floodlights around your base.
This could give an important use to the floodlights, batteries and power management.