Is this movie suppose to be a horror comedy?
This movie doesn't feel quite so serious in regards of this story.
Characters feel flat and a bit generic.
Story was interesting until the reveal which was predictable.
Even with the twist, it was a bit late to make the movie interesting.

If this was done in a found footage way, it would have more going for it.
Also why Clay acting like Shaggy minus Scooby Doo.

This possession experiment seems like a failed test.