WOW. I am blown away. That was one hell of a ride.
I got the second ending first, and it felt very solemn. I don't know what I think about that. I really got captured by the whole thing. You have done a fantastic job of making the music, art and text fit together, it's incredibly immersive.
Some feedback (very much personal taste here):
I really liked the differences in the endings. However, it did hurt the immersion when I had to restart, and skip through a large part before coming to what I wanted. (now it gets very opiniony) I think it could have been more immersive to have one cohesive storyline, but with smaller branches in it. I have no clue how that would work, considering how different the endings are, but it's an idea. There are also some points where the text feels a bit awkward / out of character. Mostly the text that is red, because of the pace that it is written out in. Also a lot off stuff in caps generally looks a bit too "discordy" / meme related for me to be able to take it seriously.
Overall, I fucking adore this, and appreciate that it's been made. Keep doing awesome stuff!