I've only gotten two of the endings, but I really liked what I've seen and played. The art is beautiful and the story was engaging with how vague and mysterious things were. Wished there was more content though since I feel there should be more to the story and characters.
Maybe that's what I'm missing from the other two endings, but I'm stuck on what else I can do to get to them. Hopefully you're still planning to release that guide. I only got one of the endings with Cain from finding a comment that told how to get to it. Not sure what else I could do for the other endings since I thought the three options in the beginning would lead to some other ending or info, but nope.