I hate puzzle adventure games so I'm not a good customer on this but I have to say, as a fan of Lovecraft, this nails what I imagine the mood, visuals and setting for such a game. Very, very nicely done!
As others have said, simple walk sounds, pages turning, clock ticking and whatnot would add a LOT I think to what is already an impressive work.
Not my style of games but I totally respect your work, kudos! One of the best entries I've check so far.