Packaging - this needs work
maps should be packaged so that the user can just throw the archive into one of the sandbox directories (that includes my_stuff and ~/.platinumarts), mount the zip in game and be good to go. That means a packages/base subdirectory top level directory is expected.
See the packaging guide http://www.sandboxgamemaker.com/wiki/in ... ging_guide
You also forgot a mapshot
Appropriate obstacles haven't been placed around the map to prevent players from falling off
Lighting is a chaotic mess, it is visually unappealing and distracting - Try to use weaker lights and place them so that they complement each other. Also try to execute some subtlety when lighting your map, eg mansion.
The ambiance could do with some work - for starters don't use the default fogcolour for night time maps, and try to use skylight or sunlight to illuminate the outdoor areas of the map, rather than relying on ambient to set a minimal illumination level.