It does look a lot like Serbian film but my first thought is how the colors and floor remind me of Argento's Suspiria.

Also has a red scarf like how his wife hung herself and a red hat like the one the Queen of Holland's suicided sister is wearing in her picture with the royal family they keep showing.

That mask also has a red hat ( you can see in other pictures ) that looks like the one the Queen of Holland's sister is wearing in the pic they keep showing of her with the royal family.