rebellious
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Well, the balance will shift a little more in favor of Dungeon, what's the big deal? No one ever promised a balanced game; it's achieved through experience.
No one plays Tower against Dungeon anyway.
P.S. And, by the way, I don't remember Tower battles taking longer. In my opinion, it's the opposite; the tactics there are usually simple – you build up in a corner and shoot, more sophisticated battles are rare. With Dungeon, there are more battles where you need to think and calculate moves. For example, battles against all creatures with a speed equal to that of Trolls are quite challenging.