Have been enjoying RTS's a lot recently although I am terrible at them. Mostly sc:bw, aoe2:FE, bfme2:rotwk with the 2.02 balance patch (original is heavily unbalanced but when patched this game is crazy fun and much easier to play than bw/aoe2).
The attention to detail and player immersion is pretty much unrivalled.
The story seems like it's genuinely trying to set itself apart from traditional / stereotypical zombie games.
Didn't see enough to comment on the game play other than to say that the environment is incredibly detailed, combat looks good and it appears to be semi stealth based (but not to the extent of Hitman obviously).
Only thing I'm not to sure about is how much agency the player has but that might improve as the game goes on.