My colonists stopped heeding build orders after about a year and a half on mission two. I just sat there with pipes and buildings queued up and the colonists milled about doing nothing. No lack of metal or components. Very aggravating.
THIS IS AWESOME! I can't wait for updates and new levels! Maybe you could add options to modify the graphics set and stuff? Perhaps replayability might be the only downside, except the option to finish each level just 1 second faster is pretty tempting.
 "Mars Colonies Demo"){kind=icon}
 "GrindQuest Expansion"){kind=icon}
 "Hello Worlds!"){kind=icon}