I gave the book a proper read, finally, not just reading the pictures and the bits and bobs that appealed directly to me. While I'm extremely fond of Crown of Salt, I think it's got one too many 'save or suck' rolls where if you biff a check, your character dies with no real way of surviving things. I confess games like Mork Borg aren't my usual wheelhouse, but I figure with the Descent and the underworld full of brine and salt being so dangerous, it would be extremely hard to justify replacement PCs.
You're not in a place anyone is supposed to be. You're in a forbidden, dangerous hellhole. And maybe there's one other adventurer there, like the survivor you can find, but past a certain point it'd become ridiculous. I also felt like, with how much information the PCs might get cluing them into the fact that gathering the Crown is a horrible idea, there's plenty who would just turn around and leave.
But I think this is just my personal tastes. In terms of save or suck rolls, I think it's a lot more interesting when you're transformed, changed, cursed, inflicted with some terrible (but not game removing) fate. The art goes hard as always. I really, REALLY liked the spinoff goblin adventure and kinda felt it had a much more solid adventure design? Felt like the goals the PCs had was better defined and having NPCs with contrasting personalities to work off is always a delight.