Loved the artwork, the character interactions and the many varied ways you can approach problems. Exploring how many different approaches there were was a joy.
Very reminiscent of Ib/Witch's House; I'm eager to see more!
As criticism, these above factors also mean the first half (setting up the ritual) is stronger than the second half (post ritual otherplace). In particular, the character interactions all fall off and the choices stop mattering, since you're just going to get haunted by passive-aggressive omnipotent post-it notes anyway.