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I played it. My first impressions. It's necessary to somehow limit players' access to each other, or rather, to their territories. Gates in front of castles are understandable, but in my game, playing as the Necromancer, by the fourth month, hordes of opponents were running around my territory. I got tired of chasing them. Or limit the number of heroes that can be hired. Six at the top and two at the bottom is not efficient. And, in general, ideally, this map would be good for four factions, each with one castle. The map is too Multiplayer-oriented, but there is no balance. In the first month, fifty High Liches joined me from above, near my castle, and then I started to do well. But otherwise, it's nothing special. Very good, actually. Given the complete lack of new large maps, I give it a big plus.
I don't think limiting access is the right approach... it would then limit the movement zone. I don't think that's the solution. You could add neutral garrisons on the borders, but that would be too much... a bunch of outposts isn't pretty. There would be continuous garrisons. But limiting the number of heroes that one player can hire is possible, but I don't know how to do it. If you suggest a way, I'll probably limit it to two for everyone except the Demons. The fact that everyone comes to you when you play alone is true; the AI always finds a way to the player (the shortest path).