TaB is a fantastic game that doesn't hold your hand. It's the Tarkov of the RTS genre, but sadly, it's pretty much one of a kind.
I played TaB in early access and grabbed all the achievements after it was released and haven't been back since. It's really fun if you enjoy a challenging experience, but it's a game that you can sink a few hours in on a single map and lose because you missed a single one-tile gap in your defenses.
Edit: Was short on time earlier and didn't get to flesh this out like I wanted.
TAB is an incredibly fun game but it punishes you for the tiniest mistake and it doesn't give you any tutorials nor does it tell you how you made the mistake. One minute you'll be in a flourishing colony and getting everything upgraded and two seconds later you have zombies flooding through a hole in the wall. The learning curve is incredibly steep with this game because it's not just about amassing an army to win. You can win with just military units (in fact there's many achievements for doing just this), but you also need to know how to best utilize the space you're given. Your resource buildings have a work area and you cannot overlap the same building (hunter cottages can overlap a lumber mill but cannot overlap another hunter cottage), so you're not only trying to build an army, push out, and expand your base, but you're also trying to figure out where to place your homes, where to build farms, when and where to build walls, etc.
With that being said, it does make surviving that much more satisfying and once you learn how to build your walls and how to tell where the zombies will come from, then it's not as difficult as it appears to be. The campaign is pretty fun, but a lot of players hate it simply because the hero missions can be a huge drag. I had a lot of fun with the game, but I will admit there were a few times where I wanted to quit the campaign because I had spent hours on a single map only to lose because I didn't notice a single zombie walking into my base. It's definitely a game where you either learn from your mistakes or you'll uninstall it and never touch it again.