I'm an AMC's The Terror fan (and fairly inexperienced tabletop player and DM) who bought this game to play with 2 like-minded friends (the game was actually recommended to me by a fandom discord) and we love it! The Captain role is a high point (a DMPC with a mechanically encouraged ability to hold grudges, whom the party can depose! Amazing!!) but the whole book is definitely worth it. All the flavor tables are great.
My only suggestion for a change would be maybe some more ideas for moderate-seriousness obstacles, especially ones that could sort of gradually chip away at them? Prolonged bad weather or Beast attacks would get TPK pretty fast, and hunting food is pretty easy with most builds. I ended up making them roll daily checks to manhaul (fail: -1HP) and make camp (fail: no overnight +1HP recover) which was workable if pretty boring. Most of my original flavor was directly lifted from The Terror--at one point I hit their camp with a ball lightning storm, like in the book.
Great game! I'm looking forward to seeing how this story ends :)