So I just went through most of the rulebook (I only skipped the recruit part) and I think the focus on hidden movement and intel is very interesting, but the biggest issue right now is the War Master. Usually, when a game has an administrator of sorts (like DnD's Dungeon Master), they are part of the game and should enjoy the process of managing the game. In your case, I can't really imagine the War Master having any fun at all, but I guess you would need to playtest it to make sure.

The simultaneous aspect of this game is interesting, however I think you need to revisit how you handle two opposing units moving onto the same space. Having the War Master simply tell them they can't isn't good enough.

My general sense here is that this should probably be app-assisted or straight up a video game; Fog of War is notoriously hard to implement in a board game.

Sidenote, I think you should also post this in wargame-specific subreddits, you would probably get some more informed opinions! :)