<li>Ahaha I'm hilarious with titles /shot Mad Father spoilers everywhere Something pretty simple for RP-blog (which also seems to be some sort of ask blog as well despite the fact I'm SLOW) [link]
I can't understand why people have problem with true ending; I think it's amazing (or maybe I'm just protective over it due the fact I RP as adult Aya). ANYWAY Mad Father is a great game, I really recommend it!!
Also, I have done some other MF-fanart as well [link]
Nothing has been said for sure, although it has been heavily implied.
However, if you want to have anything headcanon based: some fans (including me!) seem to think that while Aya grew up to be very similar to her father, Aya's reasoning for doing what she does is entirely different. Instead of being "mad" like her father was, Aya believes putting people into "eternal sleep" is a way to help them. After all, when she was a kiddo and in the house haunted by her mother's curse, Aya helped all those cursed corpses to afterlife (thus the belief of thinking death means end of suffering)!
But, like I said, it's heavily headcanon-based and therefore can't be taken as the canon truth.