Great description, was needed indeed. Visual queues for the pressureplates would help alot.
Great game tho, love the horror theme!
Some resetbutton when the monster "kills" you, would be nice add too :)
The walkthrough is pretty handy when there is no indication if I am doing something right or wrong.
As a side note, do not use the same texture for a button where player has to push block to press it, and for buttons on which he can just stand on. If not for walkthrough I would walk around the mansion with the block till the end.