itch.io

Here is an unofficial guide that fans are running. 

https://docs.google.com/spreadsheets/d/1o6VFK12N3ZITRa6Ln3ZJA0IBT5E6vHG2QCVBebPK...

I want to write a guide, but making the game has been top priority, so it'll have to wait. When I have time to fit it in, I will, especially since it's gonna become more difficult to unlock some of the upcoming CGs. The unofficial guide that was already linked is a good source for now, though!