The mixtape is a more experimental record compared to Flume's previous work, and contains features from several of his favourite artists such as Slowthai, JPEGMafia and frequent collaborator Kučka, as well as guest production from HWLS, Sophie and Eprom.

[6] While working on the mixtape, Flume felt that he needed to create a record with a more experimental sound in order to go "back to [his] roots",[6] and added that he changed his style because he was bored at doing "the same thing over and over" and "people copy [him]".

[7] In an AMA on Reddit, he revealed that the production on Hi This Is Flume was far more difficult than on his previous records as there was "way more detail", though "the ideas flowed more easily on [the mixtape] than Skin".

[10] Speaking to Triple J, Flume explained that, through the mixtape, he wanted to expose listeners "to more left-field electronic music", as well as artists such as Slowthai, JPEGMafia, Eprom, and Sophie.

He revealed that he discovered English rapper Slowthai through the track "T N Biscuits", immediately decided that he wanted to "work with this guy", and consequently traveled to the United Kingdom to record the song "High Beams" with him.

Owen Myers of Pitchfork called the mixtape "both philosophically and sonically, an inflection point" and wrote that "Hi This Is Flume is how he breaks apart his now-familiar sound, zooming in on the different layers and looking at them in new ways.

"[30] Jake Indiana of Highsnobiety deemed the record "extremely refreshing and light-footed" and highlighted "High Beams" and "How to Build a Relationship" as its standout songs, but added that aside from those tracks "the mixtape struggles to feel especially fresh.

"[15] Christina Hernandez of Dancing Astronaut commended "the amount of impact Flume manages to squeeze into such a short time span" in her review, and wrote that "the advanced sound design and clear step outside his creative cavern showcase a matured talent who continues to carve new niches in the modern electronic sphere where no artist formerly thought to look.

"[13] Sam Van Pykeren of Mother Jones hailed the mixtape as a "fantastic, angry, and existential mess of computer sounds" and called it "a reinvigorating work of electronic music.