Seems like a cool game! Is the solution messed up for the puzzle with the four windows though? I get you have to recreate the symbols shown on the plaques next to the relevant noises coming from the windows but it doesn't seem to work?
Well you are the second person with this probelm. The time the person thought that the symbol for the beast (breath noises) was a hour glass but in fact the symbol is open at the bottom.
Is that the solution?
If so I will recreate the symbols.
But in general your thoughts are correct. You have link the symbols on the plates with the right glass wall.