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It didn't impress me at all(((. It's too easy, even on Hard.
5 native Dungeon castles on the map + a horde of overpowered Sphinxes (just a ton of experience).
No matter how weak the hero is at the beginning, he simply becomes a killing machine and the game can be played on auto-battle.
More powerful protection for dwellings and mines is needed. Leave only one Sphinx (just for the start). Reduce the number of native cities to two.