Heya! Just a friendly map reviewer here. So, first of all: here are the pros.
-Nice subversion of expectations with the Black Wool first.
-The aesthetics are nice in many areas
-Nice resource scarcity
-Nice loot ideas
-Creative use of the Nether
-Blocks and area fit nicely together
I really had to stretch with the pros, mostly because of all of the cons.
-The Intersection 3 (or was it 4? I forgot.) areas all looked bland and world-edited. Same with some of the others in Intersction 3 (or 2)
-The custom loot, which was nice in the beginnings, completely disappears.
-The loot barely gets you through some areas.
-Some of the wools are WAY too obscure. (Specifically, Cyan)
-The hard areas are just spawner-spam
-Too many trolls that make you seem like an idiot and jerk, not a troll.
-You should probably tell players they need to use the portal, as I did not get the hint of NOTHING AT ALL.
-Overuse of ghasts and TNT.
-Overuse of creepers
-Was very bland
I understand it's your first map, but with the quality of the first areas, that's no excuse for the cobbled-together, poorly-thought-out, and overall unfairly-difficult rest of the map.