I just played this scenario at level 3-4 range on a bard.
The flavor and narrative was fun and enjoyable. The story is well crafted, and the storybeats keep it interesting. Creating a seafaring adventure/mystery and keeping it interesting throughout is difficult to do well, and I think this adventure succeeded on all points there. I _loved_ the detail for the hounds and the room shape requirements, I look forward to hearing about someone's creativity for taking advantage of that.
Despite purchasing as a part of the whole season, this scenario is a skip from me for GMing for PFS (where the scenario must be run as printed) unless/until its significantly reworked.
Captain Fidero's DCs are too difficult for the level range for the influence encounter, it seems like as configured it is in the 3-6 or 5-8 level range for most of the DCs. Some of the other DCs also seem to be too high for this level of play, especially with how critical they are for succeeding.
Definitely agree with the points that Stormwarden has pointed out that need to be addressed.