I just played the game and some feedback:
When there's a decision textbox, like if the door should be opened, when I press up it always goes to the bottom option and if I press down it goes to the upper option. I think if I press up it should go to the upper option. This happens in every decision texbox (I don't know how you call that).
I assume there's no multiple endings aside from what we got from the game, according to the description so the ending left me more questions than answers.
Played this on a Mac