What is the point of this map? There are no mines (supplying the main building material) near the Castles, the dwelling-1 is guarded by a hundred of Gremlins, and there are squads of level 4-5-6 monsters all around – are you supposed to spend a month gathering troops?

The number of Gremlins depends on the difficulty level, and it doesn't change over time; there are a hundred or more only on Veteran and Hero difficulty (and what should be easy? :)).
The map is not built according to the classic scheme of object and creature placement, but that doesn't mean it's impassable. Don't stand near the Castle; move around. There are less protected objects, and there are creatures that can join you.

P.S. Regarding the distance between the mines and the Castle: I made it this way to make the map more challenging because a mine, for example, is located 3-4 turns away from the main Castle. If you capture it and then go in another direction, an enemy might come and take it back. Then you need to think about how many and what forces to send to the mine so that you don't leave the Castle undefended (after all, 3-4 turns, you might not have time to return in case of an attack) and to repel the attack on the mine (if the enemy is still nearby).
This map is designed more for playing between players than between a player and the AI :cool: