Game is fantastic, visuals are fantastic, sound design is pretty great as well. I've never played any of the HOMM games so I cannot compare them but this is a very solid experience. I love that this game is usable with a controller. I can lay in bed and play it on my Legion Go and it runs great.
Overall pretty fun game. Oddly enough i found the first level to be the hardest. Took me probably 6-7 times to beat it on normal and I had to use the cheater stone. The next two levels (only other two available at this point) were much easier. I beat both almost immediately on normal with no cheater stone. I do enjoy the way the god skill system is set up. I'm very interested to see how this game expands, I would recommend.
In the beginning I was not impressed but the game definitely grew on me. Personally I skip all of the dialogue, I'm not saying it's bad or anything I just don't play this type of a game for the story normally. So commenting only on the gameplay: the loop is fun, graphics are nice, game runs smoothly on the legion go, and I'm finding the upgrade system rather enjoyable.
I usually play this local co-op with my girlfriend. We have a blast, even after death the game helps move the story forward and always keeps it interesting. The little dlcs add to the fun. While this game can be challenging it's extremely fun to play even with people of differing skill levels.