[1] Compared to the dark, futuristic, hyperpop-influenced tones of Savage (2021) and Girls (2022), My World's brighter pop sound draws mostly from dance and R&B, with melodies characterized by "captivating beats" and "delightful" vocals of the group.

Moreover, he added that Soo-man wanted to start "injecting environmentalist motifs of tree-planting and sustainability into songs" which were eventually later scrapped as they "did not fit the world of Aespa" and made the group "upset".

[2] On February 25 and 26, the group performed the then-unreleased songs: "Salty & Sweet", "Thirsty", "I'm Unhappy", "'Til We Meet Again" at their first concert, Synk: Hyper Line.

[4] During an interview for the March 2023 edition of Uproxx, member Giselle revealed that their upcoming music will be "a little different, while keeping [their] roots in the whole Aespa vibe" by "show[ing] a versatible version of [themselves]".

[22] In an online press conference in Seoul for the release of My World, Karina explained that "Spicy" was chosen to be the lead single, because the group first listened to it "a long time ago", but the song "was so good that she could not forget it".

[23] The singer also revealed that "Welcome to My World" was initially supposed to be Naevis' track, but Aespa found the song "so good" after listening to it that the girls "asked if [they] could do it".

[25][26][27][21] The second track and lead single "Spicy" was described as an "experimental" dance, pop and synth-pop song characterized by "intense synth-bass sound [and] dynamic beat rhythm".

[25][28][29] The third track "Salty & Sweet" was described as a "futuristic" dance and hyperpop song centered around "rough" industrial synth grinds and bass rhythm.

[31] In the fifth song "I'm Unhappy", the group uses the digital world as a metaphor for "feeling disconnected from those around them" and longing for "the real thing instead of social media's fake facades".

[31][25][18][28] The sixth and final track "'Til We Meet Again" was described as a "gentle" and "mesmerising" ballad song characterized by "string performance" and "acoustic guitar" with lyrics about "the love of Aespa members towards their fans, who are always connected through music".

[15] The video for the lead single, "Spicy", features the members as "a group of popular high school students" that throw a "wild party" and explore the city.

Rhian Daly of NME stated "My World might water down the layers of SM Culture Universe (SMCU) in its songs, but it doesn't dilute the sound that Aespa have become known for" elaborating that "[Naevis] which has been heavily referenced in their previous tracks feels much more subtle and is easily missed however she is there if [the listener] are attentive".

[25] Writing for AllMusic, Neil Z. Yeung gave My World a 4 out of 5 rating, citing it as an "absolute breath of fresh air" in the K-pop realm.

[39] In her review for Dork, Abigail Firth stated that with the mini album Aespa shows a new side of them while "doubling down on their versatility and expanding their ever-intriguing universe".

[31] IZM critic Seonghyun Han stated that the EP is "not a declaration of territorial occupation, but rather a signal to cross the border and open a gateway".

[44] In the first week of release, it was reported that My World sold more than 1.6 million copies on the Hanteo Chart, surpassing Blackpink's Born Pink record from September 2022.

[48] According to the International Federation of the Phonographic Industry (IFPI)'s Global Music Report for 2023, My World was the twelfth best-selling album worldwide, having sold 2.1 million units.