Is This Video Game HAUNTED? (Petscop)

The Petscop series has concluded... so we think. Now, the ending we got left me with a LOT of questions. The one that has stuck the MOST - is whether or not this game haunted by the spirits of one or more characters we see in the game. Theorists, I've gathered all the clues and easter eggs together to figure out once and for all what is going on in the game of Petscop and the family whose story is the centerpiece to it all. Let's go!