Can be very swingy in difficulty. The riddles are just fine difficulty-wise, not too hard - not too easy. The zombie horde can be incredibly deadly if the party doesn't realize fast enough that they have to focus on the puzzle instead of the mobs. The zombies are very tough and very hard to kill for low-level characters and the creeper can potentially one-shot a player and insta-kill them if they're unlucky.
The encounter adjustment suggestions for the boss fight seem completely off. the weak party gets just a regular solo Yuan-Ti Pureblood with some Legendary Actions/Ressistances but those aren't enough for her to provide a challenge against a mid Tier 1 party. Definitely needs some additional spellcasting abilities. The tougher options also seem a bit too tough. Should probably use lower HP on the boss in that case.
Looting during danger sounds interesting as a concept but has the potential of leaving the party empty-handed at the end. Feels a bit unrewarding considering the difficulty of the adventure.
I really liked Wadumus character and the given quotes made it really simple to characterize him and make him likable even if the characters didn't play the previous part of the trilogy. Which makes his completely random betrayel at the end even more frustating. Would have prefered him to stay as a friendly contact/guide for the party in future adventures of the season.
[3 of 5 Stars!]