This was such a good game I ended up trying to create an account to comment, only to unearth this forgotten account. So, that's cool.
I'd like to thank my autism for the extensive knowledge about mythology and etymology, so the moon references were hitting me like a sucker punch to the face. I put together that the killer had an obsession with the moon, but it wasn't until I went back over all the notebook pages that I realized. Genuinely had an "oh...oh SHIT " moment.
Kudos to you for this amazing game!