I was talking in the Mausritter Discord about how much I absolutely love this setting and adventure, so I thought I'dleave a comment. I haven't played Cairn, but this adapted easily to smaller mice and my group thoroughly enjoyed our sessions playing this as an island themed version of Mouse Guard lol.
We usually play a 'mice in a human world' setting (whether the humans are still around, or have since vanished, is variable), but this was great as a little grittier of an environment than we were all used to.
Combined with the Gazetteer and the Sewers supplements, Salthaven will always have a place in my worlds =) Thanks enabling some great memories with your lovely world!