Awesome one-shot! You will find it to your liking if you like a combat-heavy dungeon crawl.

My party went through the whole session over 3.5 hours with four players at level 2 with a free feat. I feel like it was just the perfect difficulty with a LOT of close calls. At level 3, IMO, it would be an average difficulty for a 4-man party.

I played this as a one-shot for a campaign break for Yearning to Breathe Free. It's a great way to add more to the setting, especially if you allow the players' progress to affect if Criella ends up with a habitable basement or not as an extra stop for the Brimstone Trail.