I mostly think the game is good as it is, but since this is a group play I'll give some suggestions
*There were some clues I think could apply to more than one object. For instance dollie in the attic (there were 2 dolls) and brown bear (there was one light brown and one dark brown).
*Maybe add themes to rooms? One room could have fewer goal objects, that are more difficult to find (like art deco flower and the mask). One room could have riddle clues, like "pointy things" (there was something like that?) or "something chilling" (the fan).
*Maybe add some sort of significance to the choices other than the order of rooms. Not sure what kind of choice that would be though