In a press release, Lewis said "I was put on to Ruel's music about 18 months ago, and watching his growth since then has been amazing.

[5] Kat Bein from Billboard said "'Flames' is smooth and funky, with a slow-jam melody that wafts over a menacing, '80s-style synth rhythm.

There are bright moments of almost hymnal quality at the pre-chorus, but the fiery elements lick back up the sides to slow burn the vibe.

[2] Juliette Stuart from Coup de Main Magazine said "The track is chill yet remains upbeat and maiden with synths it manages to be funky yet calm.

"[6] Alissa Arunarsirakul from Ones to Watch called the song "electrifying" saying "'Flames' incorporates Ruel's tender vocals and Lewis' warm electronics that remind us of peaceful sunrises after a night of good fun and treasured memories.