I'm not familiar with the story myself (only Junji story I know off-hand is Amigara Fault) but I had a nice time experiencing it the first time through this! Felt like a cool adventure that had a lot of good effective spooks (especially the time where it creeped up during the talk at the soda machine, jeez louise), very neat art and animations, and immersive, atmospheric sound.
The sound was a little hit and miss at times. On one hand, it did do a good job at having really spooky music and sound effects that immersed me into the experience and got me all tense, and if you wear headphones, you can get spooked as the sounds change direction based on your position. On the other hand, the way the sound transitioned from ear to ear based on position was too sudden instead of gradual, and I felt like there were times where, when approaching the loud room for example, there should've been a gradual increase in volume as you get closer and closer. I feel like it kind of ruined the last bit where you hear it stomping away, wasn't sure what was happening since the sound was a bit confusing in the way it was trying to communicate. (I'd admit my headphones aren't that great so it could be an issue on my end, perhaps).
Ending was a bit bleh, in my opinion, though perhaps that's no fault of the game but rather the source material: I wonder if it would be better if I was caught? Wonder if that's what happened in the actual story. Maybe I'll go back and get caught intentionally just to see what happens...