Following a public falling out with former record label Mad Decent in 2016, Liz released a one-track experimental pop mixtape called Cross Your Heart.

This experience fueled Liz's creative pursuits in creating her debut album, calling it "a culmination of a lot of work I did independently"[2] As the title implies, Planet Y2K features "sonic flavors reminiscent of late '90s / early '00s Europop scene and features influences from various artists of that time period including Britney Spears, Kylie Minogue, DJ BoBo, DJ Sammy, Spice Girls, Mandy Moore, Dream, Savage Garden, and Ace of Base.

[1] "Self-love anthem" "Diamond in the Dark" features vocals from American pop artist Slayyyter and production from Dylan Brady of 100 gecs.

[1] "Lottery" features American drag artist and rapper Aja and has been described as "sound[ing] like Britney Spears gone full hedonist".

[1] The post-modern "Bubblegum" features "hyperspeed, chipmunk-sounding vocal effects, and rubbery production to back the campy, over-the-top lyrics".