The ghost girl is just like a mascot of this series or maybe many other future games. She's the one appear in the splash screen (the very first scene of the game).
I think the cause of headache is the high pitch of the doll voice, it was literaly the Son voice with higher pitch. I just changed both of their voice completely and lower the pitch of the doll down, lower than the Son. Thanks for you all's feedbacks!
Thanks for the review! The Animation style was inspired by classic horror movies, when they just used practical effects and stop motion instead of CGI.
