Alright, Islar, here it comes
You've made several maps so far. They've been poorly received, I know how it feels. I've made many maps for the Remake, and just now started getting some reception. However, I believe that you have finally made your "big break" and I'll do my best to help make this map played!
Overall, the looks are very pleasing! I will say very little on aesthetics, because you have found a personal style that contains its own personal beauty. You've also chosen a nice name. Simple but quite accurate.
I tried finding significant problems with your "mirror" but you really have done a fine job. It looks like you mostly gave up on mirroring 2/6, but the locations are still quite comparable in playability. 1/5 are very good in being mirrored. Without playing, I can't see any differences
except that location 5 does not really have access to the 100 fish, whereas five can reach it very easily. Maybe you can bring a river down so player one can catch the fish?
The leather locations are the problems. They are not comparable and look very enjoyable to build on. To give you an idea, a leather base needs at least 9-10 farms and 10 woodcutters in order to make a nice army. Some locations just don't have room for it. Location 8 looks unplayable. He has one huge annoying forest in his only available farmland. I think you should split that forest into two pieces anyway. Having just one big forest is not interesting. I think that you intended location 4 to be the mirror of 8, but they really aren't. 4 has way fewer trees and much easier farmland.
Now, the biggest problem in this map is camping. With all players snuggled together, there is little reason to control the center of the map. I believe that there are a number of ways to help alleviate this problem:
1) These mountains:
Really need to be removed. They make it very hard to assault. As of right now, armies will not be able to attack with their ranged and melee will easily be picked off as they squeeze through the tight spots between mountains. The mountains circled in blue only need to be removed if you make another passage through the part of the river that is near the waterfall. When I say "remove" I mean make smaller or move them away from their current position. Basically, give attacking armies room to move around.
2) Force the players to build near their borders. This will make camping inefficient because players will be hurting their economy with armies standing around. It is also very hard to actually defend like this once the attack begins since ranged units won't have room to organize. Further, attacking armies can pick of buildings and citizens with archers. You have already done this quite a bit with the bottom locations, but the top has a large buffer between their cities and their boarder. Make them build near that river somehow. Move coal/farms/trees or similar things like this to make it happen.
3) This is just a thought, and will be a huge change, but maybe you could cut locations 1/5 off completely from their respective teams? This will make it very important to control the center of the map as that will prevent 1/5 from being crushed by the enemy, respectively. If you do this, I recommend giving 1/5 a boost, such as having one more laborer and serf than the other players and having +10 timber and stone. That's all a bit drastic, but maybe you could instead make the passage that connects them as narrow as possible. This will make it very hard, but still possible to send support through the mountains.
And that's about it I think. In summary:
1) Make locations 3/7 and 4/8 more balanced and more playable.
2) Stop camping!
3) Remove those mountains I circled.
4) I didn't mention it, but it is almost a standard to have +1 serf over builders. i think you should delete a builder so you start with 6 serfs and 5 labourers.
Good luck Islar!