Canyon Dwellers

You're on this planet/in this place where the surface is unlivable for some reason, but down in these big shafts/canyons, you can survive and build.

• Side-on colony builder.
• Not platforming though. 
• Mostly give orders to colonists 
• (Would it break things or be fun to directly control them in some cases though?)
• Fluid and gas management!
• How do you get water to go where you want it and not where you don't?
• Ventilation for smoke?
• Maybe even light management if we want to be silly
• Be thoughtful in how you lay everything out.
• Also obviously the colonists have lots of personality and relationships and cutscenes where you make choices about them. :P
• Maybe we do that thing with the character arcs and goals
• How dangerous is it?
• We're not really excited about traditional combat.
• Environmental threats
• bad rain from holes
• mold
• maybe bad creatures
• but you don't just gang up and hit them with swords, maybe there could be a more puzzley way to deal with it.
• Maybe people can die
• But probably not from like, starvation because that always sucks
• Death would be a big sad event

Ultimate goal - change something fundamental about this place so that the surface is livable.