Also saw it over the weekend and thought it's an amazing debut feature for the writer-director. Beautifully conceived and shot, full of sophisticated pseudo-Jacobean dialogue, great design, incredible cast, and food for lots of thought afterward. The basic idea that sexual repression can result in all kinds of insanity is one I can happily sign on to.
Cautions: Be prepared to have a REALLY tough time understanding a lot of the dialogue for the first half of the film-- it's not only a challenge wading through the archaic words, but the actors all have strong Yorkshire or Scottish accents, so it definitely takes some time to acclimate to their speech. Also, there's a bizarre habit of the soundtrack to load up on all those cliche horror clangs and bangs and creepy whispers offscreen to needlessly jack up the scare quotient. The effect is that the sound mixer (or director) didn't trust the screenplay enough to present it in its purest form. Lastly, I took great exception to the choices made in the final scene, something I don't think I can fairly discuss without spoilers.
That aside, I give it high marks, and hope it finds its proper audience-- a smart, theater-savvy, Shakespeare-friendly one.