So, when you get right down to it - this is a very simple game. You solve a handful of puzzles, see a spooky man, and the spooky man chases you. In that regard, it's quite straigthforward.
But that set design though.
The whole apartment is brilliantly set up, the sheer amount of religious paintings setting things off in your head, reading the notes, hearing the noise of radio and TV. The whole thing was unpleasant to BE in, knowing what kind of person lives here, and you really deserve some major props for that - so well done!