_Thanatomorphose_ is like a really gross, fearless version of _Contracted_, which came out just over a year later, and must have been inspired by this.
The movie has a very simple, almost nonexistent, plot: girl begins to rot, rots more, the end. Every part of the film is sparse: small cast, almost no dialog, low light. About all it has in abundance is nudity and gore. Almost no violence here, instead we're given loads of bodily fluids: piss, shit, vomit, jizz, puss. The music is an interesting mix of sad violins, and harsh noise during dream sequences. The beginning could be called boring with its long shots of nothing happening, but once our lead character - played by the beautiful Kayden Rose - begins to decompose, there is a steady momentum.
I get it, minimalistic, graphic, indie body horror is not going to appeal to many people. For me, I thought it was great. To make a feature film that really commits to the premise, and doesn't care about explaining itself, well, it's pretty impressive to make that work.
Furthermore, I have seen many movies, there are some that have a large budget, but are totally forgettable. This movie, I will never forget; I was deeply affected by it, and that's hard to accomplish. This leads me to suspect there is more to the simple story than just gore. As to what it is, I don't know. Though, maybe it's just what it appears to be: a girl rotting to the point of death.