I got this game for round 3 of the IGMC judging. First, congrats on getting to round 3!
Overall I started out not sure what I was doing except having to find her sister. After I found her I had no idea what to do or why. A little guidance would have been nice. I did eventually get to the end though, so was able to stumble to it in the hour I had.
Also for some reason the bookcase puzzle didn't register the first couple of times I selected it, it wouldn't let me try to arrange the books. No idea why that happened, but it did eventually work.
For some reason though this game made me think of the older adventure game Uninvited. Probably just due to your use of a mansion and such too.
I do feel a little more direction and better clues would significantly help this game though. It took forever to find the 6 candles. I'm sure with more time that could be added in though. And again, well done on getting to round 3!