No-commentary playthrough:
This was really cool visually, but a bit clunky on the technical end. Once I reached the room with the flamethrower, the game kept looping me back to the section where the thing first confronts you. To play the ending where you shoot the flamethrower and to see the ending cinematic I had to exit the game and select each option from the menu respectively. I saw in the comments that you were aware of this to some degree, but I wasn't sure if you'd encountered the issues exactly as I described them.
I'll be checking out your next project, though! Keep it up!