Great game!
The sketchy, black and white art was really effective at conveying the tone of the story. Piecing together the story with each reveal was interesting. It was pretty sad to read everyone's emails and then see their memories in COSy, realizing that they're all dead. I gotta replay it sometime to see the other choices and go through everything again with context. The "(no correlation)" line in the credits made me laugh.
How many endings are there?