The idea is great, the look'n'feel is spot on,the "tedium" of the job is well done, as is the good implementation of the map that gives you the general layout without showing where you are (I had no trouble navigating based on that).
But, like the others said, the game could've used some better tooltips and information. And I think I had some issues with the controls as well. The more I played the game, the less responsive controls became, as if the game itself slowed down (memory leak somewhere?) and I even got unaligned from the grid a couple of times, with my rotation stopping at an angle that wasn't 90 degrees. This made interacting difficult, but I think I just caught some rare bug.