I'm glad I watched it with Rifftrax, is all I have to say. I enjoyed the effort and the general attempt, but the actual movie as a whole was kind of meh. The characters were whiny and unlikeable, and while I appreciate realistic dialogue, there is a limit. (That limit is somewhere below having an ENTIRE MOVIE whose dialogue consists of: Woman - "Don't." Man - "But I waaaaannna!")
The ending underwhelmed me completely. I generally enjoy the 'less is more' approach, and I actually was quite creeped out by the whole attic sequence (and the nice touch of Katy's hair blowing just as she says, "I can feel it breathing on me!") However, the blatant in-your-face sequence that wrapped it up left me cold, and the stupid text that came up afterward made me snort derisively. It was like the last line of one of those cheesy ghost stories they sell to nine-year-olds.
You know what would have made a way awesomer ending? Last scene just as it was, with the walking out and the screaming and the leaping and the screaming and the quiet and then the footsteps, slow, slow, slow... and then WHAM, the door slams, locking the audience's perspective inside, and we never see what happens. I'd even forgive the stupid cheesy text plate after that, because it would be creepy as all get out after the strangeness and ambiguity of the prior scenes.
Both Blair Witch and Cloverfield did the ending better than this version. Heck, even Quarantine did it better! Srsly, Random Newbie Filmmaker. Lern 2 scare.