I love this, the concept is great! (Aliens in medieval fantasy make me think of Jacques Vallée's Passport to Magonia) I love the art for cover and the queen, really vibrant and fun!
layout wise it is nice, clean, easy to read, with only issue being the white text in the main body of the cover being slightly hard to read, perhaps another translucent or opaque background for the body text, or a weightier font might have made it slightly easier to read.
The spin-down/degrading dice mechanic is always enjoyable and something I love to see and use, so it is a nice touch of dynamism to the module, the keys are well written and use formatting and font-styling to separate information clearly. There are few typos or inconsistencies (some missing spaces, Thraxxus and Thyraxxus, etc.) but nothing another pass of editing wouldn't resolve easily. The rooms themselves are all solid and coherent, the puzzles with the choir, the radiating chapel and the lady's chapel are great too and effectively call the players to pay attention.
The creatures and NPCs are really thematic and reinforce the themes established on the cover page, some of them are scary threats in the best way.
Great stuff!