With Lux Prima, the duo craft "sprawling, soulful [and] cinematic" psych rock.

[13] 1960s orchestral pop and the "packed and dusty" sound of 1990s trip hop are also worked in.

The Guardian called it "complex and lingering," praising Karen O's songwriting in particular.

[15] Pitchfork also praised the album, recognising Karen O and Danger Mouse had "concocted a lush, vivid world on their dreamy and poignant collaboration."

Pitchfork did criticize the choruses on the record, saying "Lux Prima works better as a journey than a destination"..."that never sounds better when going nowhere fast."