I finished it. Here are my impressions. It resembles the Campaigns from those Heroes games, yes. But! We shouldn't forget that back then, many editor elements didn't exist – for example, you can't move heroes between scenarios. But now, I think it's absurd to start each Campaign map from scratch with a new hero. It's not a scenario; it's three separate maps, and, frankly, they're quite weak. The terrain rendering is terrible, there are no interesting features, nothing! You just go and kill. I didn't like it, sorry. I don't see the point in continuing in the same vein. I apologize to the map author for such a negative review. This is just my opinion. Maybe someone will like it. Good luck to the author in the future, because I really like his maps.
Added 3 minutes later
And how about creating a scenario from the fourth Heroes game, for example, "The Wandering Hero"? That would be interesting!
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Well, I've decided that if I continue making a remake of the second game, I'll only do it with significant changes to the design. Okay, I'll keep working on the fourth game for now, but if it doesn't appeal to many people again, I'd better work on something of my own.