Auto-translated
The campaign is interesting, but there are things to add in terms of difficulty. In the 2nd mission, it would be good to make it so that the Orcs also attack and make sorties from their islands, at least from two of them. You could also make it so that a demon periodically appears and attacks until the gates are closed. In the last mission, on the contrary, the heroes need to be weakened; their stats are too high for such an army, and they can take out entire units in one hit, even with high defense. This is especially true of the Faceless One, who creates phantoms. Why, if he already has over a hundred dragons? It's almost impossible to pass. It's not clear why it was done this way. This doesn't make the game more interesting; on the contrary, it discourages you from continuing. In general, the balance still needs a lot of work in this campaign.
Regarding the voice acting, it's better not to do that so much; it's unpleasant to listen to, and the voices are terrible. Out of all of them, only Lucretia has a decent voice.
And there's another question about the plot: what is the dark elf doing in the human castle in the 4th mission? How is this explained in the lore? I don't see the logic here.