[4] Allmusic's Thom Jurek wrote: "Myrkur's music melds all of her adopted stylistic elements, lets their seams show, and emerges with an innovative, alchemical creation of her own.

"[1] The Austin Chronicle critic Michael Toland stated: "Danish raven Amalie Bruun integrates extreme intensity into both genres' [goth/black metal's] inherent drama.

"[2] Sean Barry of Consequence of Sound thought that "M doesn’t differentiate itself greatly from the early work of many black metal artists."

critic Natalie Zina Walschots praised the album, writing: "The textures of M are even more finely hewn and interwoven than its predecessor, resulting in a record that is at once profoundly tactile and deeply sensual.

Joyce further concluded: "She comes out of more subdued sections to use blast beats like scare tactics, drops in glacial vocal harmonies as soothing lullabies.