Story
The story overall isn't that amazing or deep or complex, but it certainly was awesome to watch unfold. The development of the story and characters starts really slow at the beginning, but with the turning point in the story speeds up a lot.
It's horror without being scary but instead more crazy and eerie with a lot of gore scenes.

Production
Don't expect too much on the production side. It isn't thaaat good.

Cast & Acting
The cast consists of pretty much unknown actors, who still did a great job.

I didn't really pay much attention to the Music so i can't say much about it, but it definitely wasn't bad that it hurt the overall story/movie and it helps the eerie feeling.

Rewatch value
It's good, but i wouldn't really recommend rewatching it. The story isn't that complicated that you need to rewatch it to understand it, and it isn't that pleasant overall to look at (all the blood and ...).

Overall
Overall I would definitely recommend this movie, but only watch it if you can stand explicit scenes (blood, violence, sexual abuse, etc.)