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Okay, if that's how it is. Building on the first point, I'd like to... remove the limit on the total level of a hero's army.
There's also an idea (I don't know if it's been implemented in the second part) to have some opponents also have heroes who cast spells in the same way as the main character.
And finally... since there are bosses in the game, why not add a couple of particularly intimidating multi-tile bosses? Three hexes would be fine, I think.