I haven't finished the game yet, but I can already say that I was taken by surprise, a good surprise. Great job!
(I will post more comments according to experience, I think that passing the feedback to the creator is important :)
Edit: OK, Now I feel stupid. I don't know if it's because English isn't my original language and that's why I didn't realize it, but... I've played (and still am, it's 2:51 am) for over 4 hours straight and I feel stupid for not have put a single correct password! The title screen of Sal's bad ending is the image I saw the most in the game aaaaaaaaaaaaaaaaahhhhhhhhhhhh
The worst thing is that I don't even know if the password is case sensitive.
Edit2: Wanted to make a note, the game is good, give the game a try if you haven't played it yet.
Edit3: I read half of the comments about how passwords are put on bad endings and I refuse to sleep without getting at least 1!
EDIT4 and last: I really am dumb. after trying 80% of the words at the end and pausing to read more than half of the itch.io comments I could see it (it was obvious, but give me a break I was too shocked to have noticed)