This was the scariest thing since Silent Hill!...
Great game, no doubt, I tried using your walkthrough but I realised that I didn´t have to when I found out about the attic, the only thing that I think people do wrong is that they don´t click on all of the clues (the letters and the diaries + the picture with a pentagram!) before they go to the room with a handle and a door which won´t budge because another being is on the other side holding the door...
The last puzzle I had to guess the order...
But a great game, and especially since it´s your debut-game...well done!