Simple Building Game

Since i can no longer host it, i'm making it an open-source game.
It's a building game (source code is included) with;
-10 icons for mobs
-4 doors
-Adjustable signs
-36 floors
-Stairs, with 10 different floors (1 for underground, 2-10 for above ground)
-20 walls
-No-build areas (use the area cantbuild)
-And 12 other objects