I love the atmosphere in this game! It also looks like it has an interesting story! Can't wait to learn more about the Freak in the Red Vest!
One thing you should work on is how Olivia interacts with items. Take this table, for example:
She automatically interacts with it when she touches it, but when I finish the dialog then turn around, she repeats the dialogue. I think it would be better if you could press a button to interact with these object, such as Right-click. It's not a problem with the letters since you pick them up and they disappear, but I could see them get annoying with permanent objects like that table that don't disappear.
Look forward to playing the next version of this game! Keep it up!