It's hard to be terrified while watching a horror movie and you have no idea what is going on. There too many (9) main characters in this movie, with an complex web of inter-relationships, never fully explained. So whenever something happens you have to ask why did they do that? Also, is one of the characters supposed to be a ghost? I'm still not sure. I assume that the director had some idea what was supposed to be going on but everything got messed up in editing when key explanatory scenes were cut. There also are many continuity errors which makes the confusion even worse. The result is a total mess and when the "slasher" action occurs, it's very hard to be horrified. What just happened and why? And was that real, imagined, or was the killer a ghost? Like I said. It's a mess. It's also very boring unless you want to try to understand post-adolescent romantic and mean girl behaviors. Also, these are supposed to be graduating college seniors but most of them look like they are closer to 30 in age.
Review of Goodnight, Light
