Lol, that's not what I meant with "the map is very opened". It has nothing to do with the roof. I meant that you can always see all areas of the map, no matter in what corner you are standing. You can't really fix it for this map, but note it for following ones. Use ways, routes, caves, etc. and don't do just a big box.
Please don't publish different versions with the same name, use b3, b4, b... if you change any stuff.
The map still isn't lighted. Run a final compile without warnings, errors, etc. If there're any troubles with it (except that it could take a long time), post the report of the black box here and we'll try to help you.