Hey! I'm leaning towards Twine for the sake of simplicity - I might try to build another version in Inform in the future outside the game jam, but I feel like the way Inform is geared by default towards walking between rooms with objects in them would make building out these systems much more time consuming, whereas Twine is more open-ended by default. I love the passenger idea - I can't believe I didn't think of that! I suspect that would help to expand the puzzle space without having to include alternate captains. If people would be interested in helping out, I might ask David if he can add a channel on the Discord.