I thought that cover looked familiar.
It’s a play on Argento’s Suspiria, which is said to be his best film. It takes place at a German ballet school run by some very bad witches. The film has a strong fairytale feel, and like most of Argento’s works, has a lot of violence. TV Tropes says the film “doesn’t play by any rules” and Gatiss called it a “cinematic fever dream”. Not much of a surprise that Italy would choose this one to showcase his nation’s style of horror film.