Atmosphere and art are SO amazing, as the narration and endings! Just a greatly conveyed horror situation.
The only nitpick I have is with the creature; after an amazing first impression (and lasting impact whenever it leaves the screen to come back with its unnerving theme) it sticks to you like a fly... And kinda becomes annoying as one, too (/;o;\). Also recovering health after some time would be amazing imo.
Wonderful job!!!