I really enjoyed reading this, an uncommon mix of eldritch horror and tragic personal story. Ana a really strong atmosphere.
After reading i have a few notes, just cosmetic or explanatory for the post-jam version: the table in page 3 should not be split, maks the reading harder that it needs to be, The Ariadne name twist is brilliant but if I had to run it, I wish to have some suggestions on what happens if Ariadne goes to the tower with the party, for example.
Last thing, is Hywel's awareness telepathic/instantaneous or requires someone to witness the cure? Could the party cure every star eater in secret? Or it's a GM choice?