Thriller comparison

Our thriller idea was influenced by a variety of psychlogical thrillers. We liked the idea of the central protagonist who is unconventional. As suggested by our title the underlying theme of the film is the mental health of the protagonist, and in our opening sequence we have the protagonist speaking to a psychoanalyst, to re-affirm this idea of the central character's mental fragility. Many psychological thrillers employ the technique of creating a character who is presented as the protagonist, but is deeply flawed. In our thriller film the protagonists main flaw is her carrying out a sinister deed under the orders of the antagonist.
From our research into audiences expectations regarding thrillers, we have found that many appreciated a twist in the plot, to keep the audience on the edge of their seats and to keep the audience guessing as to what the outcome of the film is.
The idea behind this was that ast theh end of our film, it would be revesled taht the protagonist had simply endured a vivid hallucination and the antagonist was a figment of her imagination. This sort of twist of the plot employed in films suchas "The Others", "Shutter island" and " The Sixth Sense". Where the central characters are not as they appear.
I believe our thriller film would have entised the psychological thriller audience because of the mental abnormality of our protagonist. I believe it could have included biological approach to abnormality as well.