M3LL155X received widespread acclaim from contemporary music critics upon its release. At
Metacritic, which assigns a
normalized rating out of 100 to reviews from mainstream critics, the album received an
average score of 89, based on 12 reviews, which indicates "universal acclaim". Kris Ex from
Billboard described the extended play as "spacious, paranoid, and sultry," but stated that the songs lacked hooks. Ex commented that even though the EP makes a statement, it also leaves unanswered questions. Adam Kivel from
Consequence of Sound compares the EP to the
uncanny valley, stating that the music is similar to
R&B and
pop, but it still pulls the listener out of their comfort zone. Andy Gill from
The Independent stated that the music is more focused and coherent than
LP1. Gill also commented that Twigs's art is so unique, she's "staring stardom in the face." Anupa Mistry from
Pitchfork stated that
M3LL155X builds on Twigs's previous work, and her voice "prowls" over the music, compared to her previously soft voice. Mistry also declares Twigs to be the
feminist pop star that we need. Harley Brown from
Spin stated that Twigs seems to be "growing stronger," and described the sound of the extended play as "futuristic" and "nostalgic." ==Track listing==