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Sir Kiberspeller, please forgive me, but in my opinion, your map is completely unplayable. I won't list everything, I'll just go over the main mistakes.
1) If the goal is to level up a hero, then what are all these hundreds of chests for? Picking up even a couple of dozen chests in a row is an extremely monotonous and tedious process; it's easier to create a couple of events that give +100500 experience.
2) I liked the monsters that can be easily bypassed by going around the road.
3) Ten Azure Dragons, ten Crystal Dragons, ten Rusty Dragons, 1,000 Sharpshooters... By the time you have an army and the ability to defeat such a horde, the artifacts they guard will no longer be needed (this is clearly closer to the end of the game).
4) Each of the four "continents" has 5 castles. At the same time, the resource sources are either mines (two of each type, which is clearly not enough for the systematic construction of all castles - which means that half of the castles will not be very useful at first), or resources of a random type, scattered in large piles, but they are often guarded by high-level monsters, i.e., you won't be able to reach them right away, but resources are most needed at the very beginning.
6) The landscape elements do not serve to decorate the landscape itself, but simply as a fence for artifacts and other goodies. In my opinion, this is just not beautiful.
P.S. I understand that my review will probably not be relevant after a month, but I hope that someone from the novice mapmakers will read my words and avoid such obvious mistakes.