Great game! The visuals, audio, and gameplay all work together to make for an intense and creepy experience. I've only seen the trust ending, so you may be doing something like this already, but I think it would be cool to explore more psychological horror elements where the things you see/experience may or may not be real, leading to some *unfortunate* consequences. But yeah, really well polished and loved the experience!
A couple minor things, I think a bit more feedback when you shoot the boss at the end would be helpful to know that you're making progress, because I wasn't really sure if I was doing something or not until it ended. Maybe like an animation or something to show that you hurt it. Also sometimes I'd have to click "E" twice to advance the dialog. But really solid game!