Hey, thanks for playing.
The button to scroll through/exit each note is on the right-hand side of the page, halfway between the top/bottom of the screen. It's coloured red and black. Based on your feedback, I'm going to change this in a future patch, so that it is more conspicuous (I'm thinking of changing it to be white with a black arrow, to match the colour palette of the notes).
As for the room that you can't find, I expect that this is probably the bedroom at the far end of the upstairs hallway (just past the kitchen). You can see the door in the distance when you're at the opposite end of the hallway. I've got an idea of how I can improve this, which I'll implement in a future patch.
Anyway, thanks a ton for your feedback, it's very helpful!
EDIT - I've implemented these fixes into a new patch