Great design. I'd really like to see it as a 5 player map (again), imho the differences regarding the spawn points should be acceptable. I wonder if you have ever played Battle for Wesnoth, this map reminds a lot of the maps there, mainly because of the color choices, the lone houses, small tree groups and the "rivers". In the editor the map looked rather "unwarcraftish", but ingame it wasnt that extreme.
Regarding balance/symmetry, it seem to me that the AoW-creeping possibilities are kinda asymmetric in terms of how close/far an AoW can be built next to the murlocs or the 5-4-4 ogre-troll spot. It also seems to me that clearing the trees towards the outer expansions is easier in some locations than in others (to be honest, I did not make a comparison ingame).
At the northwest and southern shops, it is possible to micro a hero around the creeps towards the back of the shop during daytime without aggroing the creeps.
Creepcamps and itemdrops are well balanced, if maybe a bit boring (for all the nice work with the outer expansions, I have trouble seeing them as a big factor in most games).
Obviously just as on TM, the players might be in an asymmetric situation depend how they spawn relative to each other, but I dont see a clear and obvious problem with that.
I trust you will do something about the AoW-creeping and maybe also about the shops, even if the map is still good as it is now. Map approved.