Auto-translated
The map is too difficult. At least, for the Hero. I approached it in different ways, but there was still no progress. Having at least two Brown Demon heroes always leads to significant losses, which are unacceptable. And the Brown Demon doesn't attack cities at all. It's also impossible to hold more than one city: the map design is such that while you capture one, you lose the others, even with skillful logistics. And there are four of them! As a result, the Brown Demon simply overwhelms you with numbers. But it would still have been possible to defeat him even on the first attempt if it weren't for the Orange faction with its ultra-aggression, which constantly has to be dealt with and which constantly inflicts losses. And it also doesn't attack cities. Although it can be exploited in several ways, the only reliable foothold for the player is the city in the Underworld. But the garrison blocks it. So, it's impossible to take it at the beginning. And the cherry on top: a simple plan to develop a strong hero with magic and succubi also won't work: Tier 3 spells are the limit, as is the hero's level 18. And the few powerful artifacts are too well-guarded to be targeted. The Elemental side requires a powerful army, a well-developed hero, and a lot of running around. The player doesn't have all of this at the right time.
Otherwise, the map is decent. And if this is the author's first work, then it's generally excellent. The cutscenes are good, and the visuals are too. Except that the plot is very simple.
P.S. It's quite possible that I just didn't come up with the right strategy. And yes, I thought about additional heroes. But there's a problem: there's no time to develop them. And there are no armies for them either.