i think that double cliff is kinda powerful and might be abused, but then again it might not and maby its just good like that. The blocks should be with neutral buildings instead, because i dont think they will be used very much in early game, and in late game you dont have miners running around everywhere. If you have a big army an wanna pass there i think its better that the army can destroy the wall. The overall look can also be enhanched a bit since twilight is quite nice to decorate. You should fix main base gas nodes however, because its just so easy to do and it has been proven that it makes difference.

The few decorations you have are more obnoxious than good looking. Like the mid.. I agree with all the GMCS comments, really, do something with those empty islands.

the island mienralblocks are also very anoying and unneccesary. its not like terran get a super advantage from fast floatin to the other side of the map.

Oh, i've miss about the blocking min on islands in GMCS ^^

Starparty is right.