I haven't played the campaign, to be honest, but I would definitely explore the artwork (assemblies rather than combinations). And most importantly, I would make the system of choosing 1 out of 2 buildings less frustrating; it would be at least 10 times more interesting, at least for me. Some buildings within the castles (like the magistrate = capitol). As for the story, I won't comment; I haven't played the campaign, so I can't evaluate it. But I would bring it closer to the Chronicle of the Ice Blade, as they seem to be connected to the fourth game.