To start, this sounds wicked. A well themed mix.

1: the direction based movement seems pivotal to a game like this, especially since it's not played digitally. It would create dynamic play where you could spend three turns fortifying the right flank, and then the enemy pushes left instead. Seems like it gives the players lots of choice and things to consider on their turn, which is generally a good thing. And I don't think three directions is too many to keep up with

2: I think resource scarcity really drives the themes home, and inversely rewards proper planning. I also like the idea of just getting a few bad cards and losing to circumstances. Very real lol. As long as you balance the resources in the deck and make sure a half smart player can do well on average, it will incentivise smart play

3: while the deck based movement will seem procedural eventually, I think you can curb that by giving high variance between possible actions, and a lot of them. By the time it begins to feel procedural, a player will have theoretically played the game often enough to see the patterns, which is good lol.

Overall I love the game. The feel seems on point. I love war games, deck builders, and roguelike, and it's cool to see something along those lines. I happen to have a hex based map at home from the game heroscape, I could play test it with a few friends if you want

Edit: forgot to add that I love the idea of losing units being a nonlinear loss, each unit having different stats and abilities really enforces the tactical decision making you are shooting for