Really liked it! Fits super well with the minimalism and also the alone challenge!
I especially appreciate the consistency you have managed to maintain between the audio, animations, gameplay, and narrative underneath also of this and also the small details! I play-tested (I mean play trying to find some bug, obviously not in a malicious way) and I did not find any gameplay problem! Only minuscule (really minuscule, that maybe you already know about it) thing I found (seeing the great level of attention to detail you put in the game, I think you could appreciate it): in the main menu if you pressed a button and then released the mouse on a different one, the hovering effect of the button first clicked doesn't appear anymore (same thing we back button in the settings menu, releasing the mouse on the sliders)
Anyways great job!