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It's not bad for a first map. As you said, there are many drawbacks.
1. The map is not very populated; there is a lot of empty space.
2. It's too easy to level up to 15+.
3. At some point, all resources except wood are abundant (50+). Wood is very scarce. The exchange rate is unfavorable; you could set up a factory.
4. The Death Knights guarding a lot of valuable items were a nice touch. Their number was a bit intimidating, but still, see point 2. You can avoid fighting them and simply cast the Astral Projection spell at level 15+.
5. Why is there only one gate in the center? I would like to see a passage on each side and a neutral territory with valuable items in the center, heavily guarded. Ideally, this should not be accessible by flying. Only passage through the gate.
6. You can get a lot of artifacts. I'm not sure if this is a plus or a minus. I collected a good set for the Elves, and at level 20, they are just a killing machine.
7. Why are there Undead at the gate?
8. It would be nice to have buildings on the map for recruiting level 1-3 creatures.
Overall, it's very good. In the first month, everything is cleared, and you just farm resources to level up; there's not much else to do. The pool with the pink swan is bugged and doesn't work; you can't click on it. We'll try playing it again on the maximum difficulty level so that we'll be fighting hard for the lumber mill, as they say. We're waiting for version 2.0 with more content and increased difficulty.
P.S. Since we were playing with my brother on Skype, we attacked each other only when we were ready, as gentlemen. We are not professionals; we are amateurs.
If anyone reading this has interesting 1v1 duel maps with two (four) castles, please share a link.