Maybe it’s not the mechanics, where the production, growth, economy, resources etc is all changed, but the base content.
It’s clear to me you have taken the content of the first game (say, creatures, weapons, factions, spells) and then worked over it, adding and fixing stuff. Adding some new traits to make the monsters more unique, and adding a few new creatures, adding damage types and balancing to weapons, adding new spells or changing a bit the old ones, adding a pair of unique perks to every race, adding new improvements and reworking the economy, etc.
You say that the factions are “are completely different!!” (exclamations added for dramatic purposes). But how much is different, quantitatively speaking?? Are they enough different to say “completely”?? They are more different, but it’s something in a scale, instead of being something binary (yes/no), it could have been done still more, and imo right now isn’t even enough to say the word “completely”.
2-3 unique perks given to each faction (sometimes being something not that radical like a pair of unique alternative equipment or a small base stat modifier) isn’t enough to say that much.
Likewise, magic is still not at the level of Master of Magic (or say, Dominions 3), I would say it’s slightly behind from AoWSM. Creatures are still far away from Age of Wonders, some stuff from MoM, or even Heroes games or King’s Bounty (if you let me stray more far away from 4x games). Races are still far away from FFH2 and some stuff from Illwinter games (and the static units from AoW was less flexible but it served the purpose of giving different feelings to each race). Etc
Fantasy 4x is a fairly “resource intensive” TBS subgenre. You need a good number of artists, designers, and coders to make all those cool spells, abilities, units, monsters, races, etc. I think you noticed it a bit too late, in the WoM development.
And let’s not talk about the tactical combat. Again, still not enough far away from WoM.
Couldn’t you put some crude, basic modifiers? Nothing uber complex. Like +acc/+def in hill tiles, +att flanking bonuses attacking from the sides/back, +att if you attack someone already “touching” two of your units (swarming, as proposed in other forum).
Let’s say WoM is a 3.5/10. FE is a 7/10, but still not a 9-10/10.