Following her 2018 debut EP Cruel Practice, Alias sees Shygirl enlist a diverse array of collaborators, including NUXXE co-founder Sega Bodega, Gloo's Kai Whiston, Oscar Scheller, Karma Kid, and the late producer Sophie.

"Freak" was released as the first single from the on 2 September 2020 alongside a self-directed music video made in collaboration with CGI artist Maurice Anderson and 3D modeller Sy Blake.

[4][5][6][7][8][9] An official music video for "Tasty" was released on 14 January 2021, featuring Shygirl in a mansion in the English country side inspired by fairytales, Disney Princesses, and Bridgerton.

"[19] This skill shows itself on "Bawdy" which sees the artist "fluctuate between ghastly clanging and unsettling whisper-crooning"[13] Vocal effects also play a big role in the EP, pitched-up on "Twelve", harmonizing in a "cyborg cadence" on "Siren", and Auto-Tune-d and artificial on "Tasty".

[21] Writing for NME, Ben Jolley called the project "a maximalist joyride that sounds like it's been beamed in from the cyber-rave dancefloors of 2080" and "Alias proves that Shygirl is in full control of her artistic vision no matter the scale.

"[16] Ashley Bardhan of Pitchfork praised the EP for its escapism amidst the COVID-19 pandemic, saying "In a year of no touching, these euphoric party moments feel far away, but Shygirl's endearing hedonism brings that sweaty room a bit closer.

"[19] Mick Jacobs wrote for Spectrum Culture, "Chock full of attitude, fun and menace, Shygirl's latest establishes a new, larger-than-life persona in addition to her trademark, detached cold-as-ice clubgirl.