Commander, We Have a Problem!

You've been elected as a new Commander of the underground colony on another planet. Walls keep collapsing, food is scarce, oxygen quickly decreases and people keep demending more and more of you. How long will you survive before you make one fatal mistake? LMB - Build selected building.RMB - Deconstuct selected building. Any feedback is really appreciated. Music used:"Impact Prelude"Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 3.0http://creativecommons.org/licenses/by/3.0/