WOW! That was very immersive and elegant game design. I was pulled in by the story, art and incredible use of sound. This makes me wish I had made my game a lot more like this. I also got genuinely scared haha.
Great work sticking to the theme and great work creating an excellent game so quickly.
I wanted to play again to see the other endings, but there wasn't a button to restart the game. I didn't realize my sanity was changing at one point because I was processing IRL, maybe shaking and adding an outline to the gauge to indicate when it's being affected, would help. Unless that was an intentional design choice to elicit panic, and neurotic checking of the sanity gauge.