Wow it was really good!
The use of light and the fact we can't rely on it much further as we progress in the game is clever. Ambiance is top notch, and those dark creatures were stressfull :'( . I found the music and sound design were very good.
The pressure was real indeed.
My heartrate surely gone up during this experience.
However, I was lost a moment, I never found the last item if there was one. And also the gauge bugged a little. It showed three bars when I could only use one.