Thanks for reporting these bugs. I currently working on some bugs I found so will deal with them sooner and upload a fixed version.
Suggestion 1 - I think it's fair suggestion. I felt like hunt were quite short if you stayed at a place ghost wont even reach your room with it's slow speed. Well, since people are going to play it multiple times, I guess I could shorten hunt duration.
Suggestion 2 - Yes, I'm thinking of making her appear near bigger paintings as well.
Suggestion 3 - You mean, toggling it on while standing in front of the mirror? Well, it will make it bit challenging. I will restrict toggling only when player is near a mirror.