I've only played this for a bout an hour, but I'm so excited about it. Please side on caution with spoiler-tags in this thread since little things and details of intrigue feel especially weighty in this game. Perhaps label the spoiler with the chapter and character or room like so:
[Early Chapter 2: Gustav] or [Late Chapter 2:Dining Room]
The game is basically a murder-mystery that takes place in a Victorian Mansion and you as the player chose where to be at any given time as the suspects move about, take actions, and talk with one another. You can pause, rewind, and fast-forward time as you teleport around the mansion examining clues and just generally being nosy.
So far, I think it is great. I love the characters and the performances. The animations aren't astounding, but they get the job done. Everyone is so friggin suspicious!