Great scenario, with some amazing gameplay ideas and options. The concept of the Queen's blessing/punishment is inspired. brutally deadly. Definitely intended for seasoned osr players, who will be used to looking in somewhat obscure places for puzzle solutions. Lots of treasure, so would make a good intro scenario for a mid level campaign.
I ran it for some new osr players, so I nerfed the DC class of every stat check by one tier(essentially lowering them by three), which helped a lot. Also lowered some of the damage. Gave some extra clues.
Overall a blast.