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I liked the map. (So far, I've only captured both Human Castles.) Considering that this is almost the author's first work, one shouldn't be too critical. Nevertheless, there are things that could be improved.
-The starting battle. A save before the attack is needed; I agree with most people on this. It would be good to give the player some time to look around, instead of rushing to the Castle. Remove the stack of un-upgraded Orcs from the army. (I don't like the upgrades given for Centaurs and Orcs, but that's up to the author). An empty stack is more important than this uselessness. If there's a desire to give them away, it can be done after the battle somewhere.
-Make the text boxes larger. The text is voluminous, the characters are talkative, and it's uncomfortable to read.
-Add a counter for the "reds," showing how many units have been destroyed/how many remain. The time given to destroy them seemed very tight. (I couldn't do it).
-The upgrade quest in the Castle is unclear. As others have written, you can upgrade in a neighboring Castle. If the upgrades appeared automatically upon completing the quest, it would save money/resources. But the quest for the Centaurs is completely off. Why does the altar require specifically Shamans (and not their upgraded version)? It creates unnecessary running around, and since there are only two heroes, it's a pointless strain.
-Allow hiring additional heroes. Many things are related to "fetch" elements, and it's not very interesting to run two main heroes around like that.
-There are many quests (I didn't complete any of them). Most of the quests are "detached" from the map. You can mostly only take them, but there's either no point or no way to complete them.
-There are many microscopic islands, on which something stands alone. For a Barbarian, getting "Pillage" is not a problem, but it's still unclear why you would visit such objects. Considering that there's no way to summon a ship, landing on an island that's only one path wide is also not ideal.
-Having to repeatedly defeat the same hero, especially with a depleted army, is a bit tedious