[5][6][7] Mike Wass of Idolator compared the instrumentation to the later work of Lana Del Rey, Låpsley and Birdy.

[8] An EP featuring remixes by Blu J, Gazzo, Jerry Folk and Aire Atlantica was released in January 2017.

[9][10] Dan Regan of Billboard favored Jerry Folk's remix over the others, saying it "punches you right in the face with its wall of vocal harmonies", and further says "silence weighs heavy throughout, adding weight to every note as it drips from the speaker into your brain".

[8] Upon its release, "Six Feet Under" was praised by Ryan Reed of Rolling Stone, who called the track "mournful" and "atmospheric".

It was directed by Eilish and shows clips of smoke balls in front of a fence, played both forward and in reverse.

In a brief promo clip posted on Instagram, director and writer Ryan Murphy, revealed a young woman running through the woods in slow-motion, being chased by a masked man holding a knife.