After seeing the twist at the end, you might think what's the point of the Pocong apparitions and supernatural phenomenons in the house that last for almost 1 hour? They aren't necessary at all for the plot twist and the movie doesn't explain what's their purpose at all. In fact the movie could just end in 20 minutes if the same act from the twist is done early to the protagonist just after she arrives at the house. It seems the Pocong and supernatural phenomenons were just put there as a filler to scare the audience. Nonetheless, I didn't find them to be scary at all. The Pocong are not a threat at all, they just stand still and can't attack. There is one scene in the movie that shows a standing still Pocong very clearly that lasts too long (about 30 seconds) and it's doing nothing at all to protagonist. This just shows the audience that the Pocong is nothing more than a standing still ghost puppet. There is also a problem with protagonist that acts illogically, but this seems to be common in horror movie. The plot twist revealed at the end is interesting actually, if the movie story could just focus on that thing from the plot twist without involving Pocong and haunted house stuffs all, the movie could be much better.
