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I was also impressed by the H4 Ultimate mod from the same person and the same link.
I'll say right away – I tried playing the fourth game when it was released, and it didn't impress me much back then. The other day, I decided to try the fourth game with the HD mod, but it didn't impress me either, only without the negative emotions. It seems that what's holding me back is the overall dullness of the picture and the feeling of unfinished graphics (I myself say that graphics aren't important, but apparently, that's not always the case ((( ). The ability to see the balance of the game is also not my forte.
What I was delighted with was the improved graphics. The brightness of the colors has been slightly adjusted for some models. A large number of objects have been added for the map and the battlefield, which fit in well and liven up the appearance of the area. The unit lines have been adjusted in terms of color scheme so that they look more like a cohesive whole. There's an interesting rebalancing of unit abilities aimed at making it much more difficult to choose between the two branches. However, the abilities sometimes look strange – for example, the copper golems (they are copper here, not gold) have received resurrection, like phoenixes, and unicorns have received flight and a return strike.
Among the non-critical but annoying drawbacks is that the unit descriptions, at least for now, have not been changed. Therefore, it will not be possible to trace the logic of the given abilities using the descriptions. The game is in English. Currently, the game does not have the ability to add creatures, so new creatures replace old ones. This is done only when absolutely necessary. Off the top of my head, I can only remember the replacement of poisonous spawn with succubi.
It's all IMHO, of course, but I'm glad that thanks to this mod, I'm rediscovering an unusual game with interesting mechanics.