As much as I like atmosphere and general story, this clearly wasn't thought out or properly bug tested.
Sometimes, my people get stuck in the ground and can't move anywhere. They're stuck like that forever.
People just up and die after a while. I found out this is an 'old age' variable somewhere. If you take the same six people with you through enough campaign levels, they just fall over dead, leaving you without people.
Extending the palisade is a total crapshoot. Half the time, it seems to get stuck and I have to exit and reenter the construction screen. I have no idea why it thinks there's a pond in the walls, because the map detail is so poor, I can't tell. Other times, it complains about wall lengths and angles. It's way too picky.
Placing an outpost is nigh-impossible, simply due to the cluttered map. I suspect there's maybe five places on any given map an outpost will fit and you gotta just keep messing around until it works.
The horrors are obviously not designed to be attacked. The wooden-tree guy killed eight people in about the time it took you to read this sentence. Oh, and for the giggles, town wall ballista can't hit the horrors for some unknown reason, nor can they be magically attacked. Why even make it an option? The developers CLEARLY didn't want this to happen, so why do it?
Non-combat stuff, can Bob, the Iron Miner, PLEASE stop running into crocodiles? He keeps coming back half-dead and just goes out there again. I tell him to stay in town, but no, Bob's gonna get this deathwish on.
I had an axeman eaten alive by giant spiders while six of his friends watched with popcorn, completely within archery range. No idea.
Sanity loss snowballs on itself. One guy dies in a fight and everybody gets scared then flees the town. I lost a couple scout groups that way. It happened so fast, I couldn't get them back to town.
Anyway, great atmosphere, but also stuffed to the brim with annoyances that could be easily fixed.