In an interview with Billboard, Rezz detailed that "A lot of the songs from the album were made, like a year ago [2020]", but the pandemic would have affected touring, "so everything was postponed.

[14][18][19] Katie Bain of Billboard wrote that Spiral "features the same deliciously ominous, often alien-sounding bass music that made her a breakout star circa 2016.

"[16] Niko Sani of EDM.com called Spiral Rezz's "most cohesive work yet", adding that "the album captures her signature sound beautifully while simultaneously showcasing her growth and versatility as a music producer.

"[14] Opining on "Sacrificial", Katie Stone of EDM.com wrote that Rezz balances Pvris lead singer Lynn Gunn's vocals with "her signature midtempo stylings," and that the track is "both sinister and ethereal in tone, expertly combining elements of rock and electronica into one powerhouse single.

"[8] Writing about "Chemical Bond", Raven Wright of EDM Identity opined that the track has a "nice and slow" beginning, "with a haunting melody" featuring both Rezz's and Deathpact's signature sounds.