I just finished the demo, and may I say it's amazing. The plot is super interesting and thrilling, the art is beautiful, the concept is really cool and the story is well-written. All the characters are really interesting and likable. The music is fitting to the story and at some intense points in the story, the music made the atmosphere feel even more dreadful and intense. Also, the opening song was really good and I really liked the video it accompanied.
overall, an amazing visual novel, I can't wait for more of it!