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The map is simply amazing. I couldn't stop playing until I finished it. I even registered specifically to leave a review. Kudos to the author.
I played version 1.0.5, so I didn't notice any particular difficulties. If you know that you need 200 archers for the siege and don't waste them beforehand, and if you don't encounter strong resistance in the dungeon, it's quite manageable. Varen's special ability and Empathy make it so that neutral mobs don't bother you. And after gaining vampirism, I basically only used archers and griffins to protect them. I caught gnome heroes in open fields or near my first town, giving them the town.
I had to replay it twice. The first time, I didn't have 200 archers, and the second time, I went into the dungeon with Varen and a too-weak army, hoping for dwellings, which turned out to be guarded as well.
The downsides are that it takes a very long time to accumulate 100 resources. And I didn't find the elven bow, which I felt should be there.