After some attempts it occurred to me the mouse needed recalibrating with the center point after I read the note and then I could open the door to the room with the fireplace...
It would be better if one had a shortcut key defined for closing the journal page and also for navigating through the notes.
The transparency for the journal pane makes it difficult to read and with the amount of text (not a lot) the font could be much larger.
It would be nice if there had been at least some notes in the bedrooms to read, and at least a final info "this is all we managed to do for the game" should have been easy to add...
I wonder what it will become if you added some more time to develop the story you seem to have in mind.