A concept album about space inspired by science fiction films, Voyager includes collaborations with Ishmael, Elle Yaya, Lil Silva, Vince Staples, Ty Dolla Sign, Kool Keith, Jay Electronica, Bibi Bourelly and Lianne La Havas.

[11] The album has been described as primarily pop rap,[7] with inspiration from soul and funk,[6] as well as observed to have an "amalgamation of modern styles – some house, some trap, some mid-tempo disco – and tunes that are poppy without seeming all that concerned about tight, stream-friendly structures".

[9] Neil Z. Yeung of AllMusic described the album as a "lush interstellar journey", a "cross-genre hybrid" and a "headphone-friendly trip that expands the mind" that incorporates "top-notch production, artistic collaboration, and devotion to the space-age vibe", concluding that it "results in a satisfying and unexpected gem".

[6] Ben Devlin of musicOMH felt that while there are "some interesting sonic tricks" on the album, the vocal guests' "performances are of varying quality" and Voyager ultimately lacks "the memorability or consistency to justify stepping into the limelight when semi-anonymity has served him [Epworth] so well".

[9] Writing for DIY, Bella Martin judged Voyager to be "a studio folly of sorts, (unsurprisingly) impeccable in sound but meandering without direction for the most part", questioning whether the album is a "trip worth taking" when "where, say, fellow magpies Gorillaz integrate their guests' styles with mostly wild success, often the turns here feel like basic seasoning, as the tracks blend into each other".