The first ending I got was White, and then I replayed to get the other two. Surprisingly, it was pretty difficult to get the Black ending. In my playthrough, I was reading about being surrounded by darkness, but the background was white, which felt off to me. I really enjoyed all the dialogue though, especially the way that the choices you make are incorporated into the story as a form of dialogue that also adds to the player character's personality. Although I personally wouldn't want to stay with the abyss character, I like how sometimes it seems to genuinely want the player to be happy.