Love this. The look of it is awesome, and the idea of the Key of the Condemned is so good that I'm going to have to include that as a boss feature at some point. It would be cool if there were more starting hooks, for how this adventure might be entered by a party that's already been hexcrawling for a while. But it'd be easy to throw this up on a missions board or something.
You have a ton of cool ideas with this adventure, and a really nice dungeon. Good job! Excited to toss this into my next campaign :)