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The main thing is that the heroes remain heroes. Otherwise, they'll turn into Disciples or something similar. That's not what we want.
Added after 4 hours and 46 minutes
I played Duel. I have positive impressions; it's a completely different game, and I liked it. It has a completely different approach. It's a bit difficult to get used to the "new units" because there are already about 21 of them in one castle, and they are all quite different. It's great that you really have to think during battles now.
I noticed a small inaccuracy (or rather, a small suggestion): when peasants call for reinforcements, let the icon on the attack bar flash to indicate that they have been summoned to battle (like Gating or Elemental). Otherwise, you might forget where the real one is.
Added after 4 hours and 46 minutes
I played Duel. I have positive impressions; it's a completely different game, and I liked it. It has a completely different approach. It's a bit difficult to get used to the "new units" because there are already about 21 of them in one castle, and they are all quite different. It's great that you really have to think during battles now.
I noticed a small inaccuracy (or rather, a small suggestion): when peasants call for reinforcements, let the icon on the attack bar flash to indicate that they have been summoned to battle (like Gating or Elemental). Otherwise, you might forget where the real one is.