At the start I really wasn't convinced that it was scary, only the sound was eerie & the vibe only got a bit scary when I turned the lights off....
... but then the subsequent days game and the hair on my arms stoop up straight for a big part of the game, well done!
The only thing I'd change is maybe picking up the items a bit less cumbersome, maybe add a progression bar to show how much of the "picking up" you've done (I think that might also up the tension since you expect something to happen at the end)