The puzzles are amazing, although I found them a little confusing or with a certain lack of clues (or maybe I am just dumb as a rock) but the story more than makes up for it, certain parts of the game (The peephole) are really unsettling and it really gave me the creeps.
The mystery unfolds at a nice peace, never giving too much or too little information and although it is a really long game it doesn't gets boring.
Keep the good work!