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I have a few comments about the map:
First, there's an unusable dolmen near the Castle. This raises a question for the map author: what if there are guard posts at the lumber mill and the mine, or even worse, at both, and you're playing as Demons? How would you handle that situation, especially with a difficult hero?
Secondly, the crystals have level 3 creatures, while the other locations have level 4. Also, the fourth location (grass) has one more relic-level artifact, which also disrupts the balance. Furthermore, considering that one location is guarded by 200 peasants and 50 wolves, which can be cleared out in the first week, and the fourth player has an extra dwelling with peasants, which the Necromancer can easily convert into skeletons, creating even more units.
Finally, "Monster Any" is a very debatable type of random monster in Multiplayer, as one player might get peasants, while another gets Titans, creating a huge imbalance.
I would suggest improving the map, adding more objects.
I'll play the map later and give you more feedback. For now, I just quickly reviewed it in the editor and noted some minor inaccuracies.