(Note: My comments are mostly focused on gameplay/design elements, not environment/immersiveness.)
I'm on Day 30 right now, and I'm thinking it's good for a playthrough or two, but probably not much more.
It could use a bit more randomization-- I've only had to restart three times, but the locations appear to be fixed. Which means once you know what's in a location, you know exactly what to bring to get the most out of it.
The character traits seem largely irrelevant, other than scavenger and barterer. Especially the movement speed guy. I suppose he'd be useful scavenging in hostile areas, but I'd rather just take a scavenger...
Positioning of furniture, other than travel time to walk to it, appears entirely irrelevant. (Why yes, I'll put my rat traps on the top floor and my rain catchers in the basement.)
Dealing with soon-to-be-ex-survivors is actually pretty easy, once you get the hang of it.
Trading appears to work by assigning an invisible value to each item (might vary by character/merchant/season) and requiring a balance in favor of the merchant. No penalties are assessed for repeatedly changing your offer, so you can mix and match all afternoon to get something as close to even as possible. (Real life afternoon-- gametime freezes when the trade window is up.)
An animal trap, baited with meat, seems to supply often enough to be self sufficient+1 person. (Two, if you can do the double meal with veggies.)
Get an upgraded heater and lots of fuel by Day 25 (might be random)-- that's when the snow sets in. Not enough fuel, and you'll constantly get sick.
Stealth kills with the hatchet are lovely. (And an awesome source for fuel.)
I owe my survival to the garage-- and how the guy there is way too generous. (Pick up junk from around him, get piles of stuff back.)
Keep morale up, or you'll end up with a bunch of mopey people who just stand around not doing anything productive, requiring somebody to waste the better part of a day to talk them out of their funk. If not more, like sucking down rations and booze.
Anybody try assaulting the church? The place seemed kind of useless unless you wanted to trade for books.