I think your idea and story are really fun. It reminds me a bit of dungeon keepers, while the goblins looked a bit like the ones from the gobliins point & click adventure games. :D
While the "commands" text gave me the general idea what I had to do, it was still not easy to understand what I had to do next. A step by step tutorial would have been of help. But there is only that much time.
I would be interested what the game would look and feel like, if you worked on it a bit more. I think it has potential to become an interesting management/stealth game.