finished it this time. I really enjoyed the story, I went for the true ending btw. I was almost stuck. When I was on the third floor on the third night, about to talk to gareth for the last time. The door where i was suppose to use the key, kept saying the door knob feels cold, but after entering and exiting the area a few times the door opened. idk how i got it to open. i honestly thought the key didn't open that door. 

Also, on the piano puzzle you can reset the timer by interacting with the piano. When you have the timer ticking away if you interact with any object the timer still ticks down. I think if you add a "\!" to the dialogue for each object it will pause the timer when reading text on the objects in the room.