In my opinion, it was because it was a bit rough around the edges... although I might be wrong... but we're getting off topic.

Not really off topic...
But besides that, Heroes of Might and Magic brought a number of significant gameplay changes, and there was an overload of text (although those who followed the plot were satisfied). And, my personal opinion, Kangem leaving the team. It feels like the game lost its "spirit" because of that.

If you look at it as an amateur project, then yes... but if you make a living from it, then....

The game has grown beyond being an amateur project. It has reached its own level. The fact that it was published is evidence of its "maturity." Otherwise, its flaws wouldn't be flaws. This is a different level, where everything is serious. And it's no longer an amateur project.

+1!!! The main thing is not to lose the "spirit"!!! because that's what your game is famous for!

That's right. I completely agree with you.

Downvote question: what is a casual player?

A casual player is a lighthearted player who plays only to relieve stress, doesn't immerse themselves in the game, and doesn't pay attention to the depth and nuances of the project. (for example, when playing Fallout, some people go on a rampage, shooting everyone in sight, skipping dialogues, etc. It seems strange: "is that what the game is about?!")
You know, there's a term that's popular now: a game for an Alabama farmer. That is, a game in which everything is simplified to the maximum. Unfortunately, there are quite a few such games on the gaming market. Although, this is more of a fashion trend and an easy way to make money.

and do you have a manual? I would be interested in reading it...

We have a manual. Here is the link: Game Manual