The feeling of dread as things got worse down the corridor, plus the indications of the emotions were so really well done and was great story telling!
The only thing I would suggest to make it that much more of a complete experience would be to have some visuals (Though I understand that this was all in browser and left to the imagination, which did make it that much more vivid and scary!), maybe not for all the things in every room, but even being able to see the room from a top down perspective would make it super creepy, as with some dark shadows, the unknown would be that much more unsettling. Having art for the bloody and scary stuff could add do that as well.
Also having the gameplay where the player picks up items and has to choose what to keep and what not to keep, was interesting and creepy at first as I was anticipating what might happen if I had too much or not the proper item, but then realised halfway through that it was just flavour in the big story, it didn't feel as compelling. Maybe having certain items able to interact with certain objects in the rooms would make it more interesting and enthralling to the player and make it that much more tied in of a setting! Having some key in one room open the bathroom of another room and there being a note on how this person had to locked a loved one in and they were sorry would make it that much more of an impactful story (This was done with one of the unopenable room and I really was into it and thought it was great!) And yeah, this was a simpler game with the main focus being the story, but having some weightage to carry the items might have made it more meaningful!
Those are just my opinions and thoughts though. I still thought the game was amazing and I had so much fun playing and getting into it. You really have a knack for story telling and they are super compelling and really fun as was this! Good luck for future projects and you did a great job on this experience!