Hi Gordon, casual games by their very nature aren't gory, but they can be creepy/scary.
I hope other members will also weigh in on suggestions for you. Games that spring to my mind are True Fear: Forsaken Souls, Mystery Case Files: Escape from Ravenhearst, Mystery Case Files: 13th Skull, Maze: Subject 360, Haunted Hotel: The X, and Fright. There are more, but I need to look at a list, as there are so many titles.