Good fun! Out of all the horror games I've beaten recently, this one takes the cake as the overall best -- for its story, not its horror. (What I said previously remains true: Nothing in the game remotely scared me, creeped me out, disturbed me, etc. I can see why it would for some people, though.)
The ending I got was
The Best End, in which Susan regains the will to live and Mitzi survives her cancer. The narration in the ending hinted that Mitzi's survival was due not just to my refusal to blow out either of the two candles at that particular choice point before the final confrontation but also to choices I had made throughout the game, and the TV Tropes page for the game describes it as the Secret Golden Ending which makes me a little surprised that I got it on my first try. All I did was follow what seemed pretty obviously like the path the creator intended rather than behaving in any remotely realistic fashion, which I find disappointing because of some of the game's themes -- I would almost have preferred if refusing to blow out a candle would have simply ended the game, or, for that matter, if choosing to put the gas mask on Mitzi and sacrificing yourself would have done the same, but I'm too much of a fan of happy endings and Take A Third Options to complain too loudly, especially because I usually complain even more loudly when games and stories take a bullshit "balance"/"everything has a cost"/"you can't win both A and B and you can't take a third option" approach when the circumstances that forced the situation were just as or more unrealistic to begin with (like when a story delivers a theme of "balance" by forcing the main character to sacrifice himself to save or resurrect their child who was only in danger or dead in the first place due to equally arbitrary or unrealistic circumstances such as a supernatural creature -- an "everyone lives at the end" scenario would in fact have been the actual balanced outcome).