"[12] Thom Jurek of AllMusic rated the album three-and-a-half stars out of five, writing that "Supernova is unapologetically and indulgently retro; a casual listen might dismiss it as mere nostalgia", however the "pairing [of]Auerbach's detailed, careful production with LaMontagne's open, expertly crafted songwriting and breezy, sensual, emotionally unburdened signing, that boundary is shattered.

"[5] At The Guardian, Dave Simpson rated the album four stars out of five, remarking how "There's nothing here that's exactly new, but by assembling an array of unexpected influences in one blissful place, Lamontagne has crafted an unlikely perfect summer soundtrack.

Club, Chris Mincher graded the album a B+, saying that "Supernova is a surprisingly bold, enterprising follow-up from an artist who could have easily ridden out the rest of his career on adult-alternative autopilot.

"[10] Saunders closing with saying that "Supernova represents the idealistic (and exospheric) possibilities for LaMontagne after 10 years in the industry, what gets lost in the experimentation is the emotional connection previously forged though clear playing and exposed lyricism.

"[11] Elysa Gardner of USA Today rated the album three out of four stars, stating that "LaMontagne's folky sound takes on a psychedelic edge, with tracks that present delicate tunes in spacious, trippy arrangements", so "If his grainy vocals can seem a little less grounded, his nods to the past are canny and passionate, so the mix rises above nostalgia.