The ability to block off specific floors for elevators would be a plus, and realistic. That way, you could have elevators that service only specific floors to reduce congestion.
Great game! Felt a bit like The Dig. Only comment would be could've used a bit more exposition on the aliens/their motivation but otherwise, a great puzzle game.
 "Decision:Medieval"){kind=icon}
 "Road of the Dead 2"){kind=icon}
 "Theme Hotel"){kind=icon}
 "Morningstar"){kind=icon}
 "Tactical Assassin 2"){kind=icon}
 "Awsome Dungeon"){kind=icon}