A fun bit of adventure with up to 3 sessions worth of material. I found only one story line interesting enough to run though. It was a bit old school with railroading necessary but we had fun over 3.5 hours playing it out. P.S. The art is super cool. Could easily be used as a one off from Saltmarsh or the like.

Disclaimer - I playtested this a few times, so I am biased.

Overall, it's a good module.

Good Points:

• tropical setting, which is probably its strongest element
• Cthulhu-esque/cosmic elements
• healthy mix of combat and roleplaying
• appropriate maps
• monster stats are listed and I do not believe a MM is required
• the final area and boss fight is pretty awesome
• mixes in the use of Madness and Downtime rules from the DMG (I recommend supplementing the modules Downtime rules with the UA ones)

Points for Improvement:

• minor formatting issues (if I understand correctly, certain enemies are required to use improvised weapons which is not put in their stat block)
• some plot points (no spoilers) may require adjusting due to character choices
• over usage of downtime (though the module is easily compressed, I would recommend introducing a certain palm house around Part 2 or 3 of the module)

In my estimation, it takes about 9 hours to complete unless you flesh it out yourself (there is a list of possible sidequests that are fairly open-ended for that). I think it would be best done in 5 short sessions, with downtime discussed in between sessions.

My players loved this adventure. It was mysterious and engaging and had lots of places for the characters to wonder and go their own way apart from the main story. The encounters were original and it contained great new creatures. It is well written and has some funny bits for the DM in the module itself. Highly recommended.