While not bad as a flash project it does fall somewhat short when you compare it to the fanfic on which this is based upon. For a horror piece it lacks enough set up and tension to make us truly wince at the punishment inflicted upon Rainbow Dash, and at the same time its complete lack of sound means that it has to depend solely on the visual to convey how terrifying the scene is.
Sadly the action is far too fast and quickly paced such that the effect is almost comical, of which the worst offender was Pinkie pulling out organs. Had sound been incorporated and had you given the piece a slower pacing to let each atrocity have weight this would have been much more effective and scary.