Cover: The artwork makes me think of Robert E. Howard’s The Black Stone (1931) or Dr. Who The Stones of Blood (1978) or British folk horror children’s TV series Children of the Stones (1977). It has a definite horror vibe.
The background colour is quite dark so you have to look hard to see what it is. A little more contrast between the sky and the stones might make the image more arresting.
Nice choice of fonts but looks a bit squeezed at the edges of the page. Some space around the text would give it room to breathe.
Interior layout: I like the double-page interior spread with map and descriptions, with detailed stat blocks on the back page.
Moon phases in place of page numbers is a nice touch.
Text is very tiny. Stat block text is even tiner! I have to zoom in to read it. If it was printed out on a single A4 page, I’m not sure it would be legible.
Adventure: The setup is a classic quest for the missing princess. The read aloud section sets up the mood nicely.
After that I was a little confused. The language is quite evocative but I didn’t follow the logic of the scenario. The mechanic about pools of blood is interesting, but why? I didn’t really understand what had happened to the princess. Why is she now a bloodsucking monster?
The numbers on the map presumably correspond to the creatures on the left. There are 10 or 15 of each number, is the intention that the party encounter them one-by-one? The first encounter would be interesting but after that it could quickly become repetitive. If the intention is to encounter a group, you could just write the number of each creature in the description.
It would have been nice to include the creepy standing stones from the cover into the adventure.
There are a lot of interesting ideas and potential here, but I felt like I am missing the link that draws it all together. I admit I don’t play Draw Steel so forgive me if I am missing some important background info about the game or setting.