Frostpunk and Frostpunk 2 \ Darkest Dungeon
Personally I thought This War of Mine was good, but pretty flawed. Frostpunk and Frostpunk 2 don't really seem like a degradation of the studio's quality.
If you're looking for games with incredibly similar gameplay to This War of Mine, there's Siege Survival: Gloria Victis.
DD2 I can kind of understand with the departure of its overarching gameplay loop (though the battle system stayed the same). I did like what I played of it, though.
What I've noticed is that a lot of indie games try to copy DD and fall utterly flat. So maybe Red Hook was trying to breathe some life into their series and not get lost in the masses of games that came out and tried to copy them after DD's success.