Niobe, basically, you tied too many things to entities. Cut down on that number, and it will compile fine.
As for the actual map, you could have added a lot more detail, in my opinion. It really isn't a good idea to have a load of your map destructable because it causes a bit of problems from too many gibs at once to high WPoly - both cause low fps. I remember when I made a signature a long time ago, a lot of it was fancy animations. Prowler, god of all that is 2D and 3D, said that it should be the art that makes the signature, not the animation. For you, it should be the detail and creativeness of what you did that makes the map, not the breakables.