I loved the horror movie guessing game. It felt very authentic, made the characters feel like real people. I don't play that particular game with my wife, but it felt like the kind of game we would play while out on such a trip to help pass the time, and then it could become the creepy focus.
The interesting thing about this story is that I'm not sure that anything supernatural actually happened. The protagonist seems to think it did, but all the clues were subtle enough that he could very well just be freaking himself out because the house bears such a resemblance to his favorite movies. Even at the end where he doesn't want to look at her, he never actually sees anything because he's too scared to look, right? Or did I miss something.
In the end, I'm not sure if I like it overall. I think I did. I feel like nothing actually happened, except for a possibly-creepy relationship with the aunt, though I'm guessing her mother just sent her the pictures. I wondered for a while whether it would turn out that the mom and aunt were different parts of the same person, though I think that sprung not necessarily from any actual clues but from my mind exploring the possibilities. So, yeah, I think I liked it. It doesn't get confused in my head with other stories, which it probably would've if it had taken a more conventional approach.