I'm not a huge fan of the HOMM series, but the demo was extremely interesting to learn. And the initial tutorial pointed out the main mechanics and allowed me to recall others that can be controlled during the game.
This game feels like a remake of the third legendary part of Heroes of Might & Magic, in addition to some mods for new creatures and factions. Familiar objects, units and music - allow you to recall some memories from the past, which will further absorb you in to the game.
Despite the lack of a campaign, multiplayer mode and a limited list of factions - in all other respects the game offers a full arsenal to try out - and that's cool.
As for the full release of the game - I'll have to wait a few years for the price to drop a bit :)

• Low PC requirements for a comfortable game, which will allow you to run it on most systems.
  
• Three main game modes, which I only watched on YouTube, namely: Arena or as it is called in the community "Luck Test" (where we choose a hero, his talents, artifacts and army), Classic (I think the name speaks for itself) and my favorite - OutCast (Controlling only one hero throughout the entire game).
  
• Wide variability in building your army. By gaining 2nd level for each unit, you can choose a certain specialization for your style of play.
  
• Beautiful game design. Cities, map, units, artifacts - everything looks cool.
  
• Additional characteristics to second-level and third-level talents. Which add even more variability in hero builds. My favorite was: "You get a concentration charge when your units attack" and "You get a concentration charge when your units take damage". A very cool combination that allows your units to almost constantly use active abilities.
  
• A wide list of spells that I never learned in 15 hours, as I only used some of them. In the tutorial, there was an opportunity to gain an advantage in battle only due to spells and correct positioning, but in practice in a match - I never tried it.
  
• The section of laws, which gives the opportunity to strengthen your faction, both economically and militarily.
  
• The generation and position of items are sometimes hidden. Yes, you can press "Alt" and see all the active points, but it is quite interesting to study each fragment visually on your own.

• During battle, the hero's banner overlaps the display of the received damage for the unit in the upper corner of the field.
  
• The menu for viewing equipped artifacts does not have a filter by sets. When you have a bunch of artifacts, you have to check the description of each individual artifact to make sure: "Does it fit for set or not?".
  
• While the hero is moving along the route, you cannot use the right mouse button to view the map at the same time. The hero will simply stop.
  
• Some spells and units do not have sound effects. That's what this demo is for - to fix all this.
  
• The middle and late part of each match turns into a "snowball". And you are actually just collecting resources and strengthening your army, while the AI ​​quickly calculates the outcome of each match (usually in our favor). In my opinion, it would be nice to have the need to enter the battle in manual mode in some cases.