Writing in Smash Hits in 1979, Red Starr said the album was an "intriguing but only occasionally attractive array of verbal and musical images".

[7] Steven Grant echoed Starr's ambivalence in Trouser Press, saying that the album "has an obsessive strength — like Eno in his stranger moments but without his repetitiveness," but that "The music, though fascinating, is rarely coherent.

"[9] In a retrospective review, Head Heritage described Mix-Up as "a great snapshot of a brief period in post-punk UK when there was a sudden urge to grapple with a bizarre, homemade, hamfisted white dub landscape.

"[11] AllMusic writer Andy Kellman was less favourable, writing that "Cabaret Voltaire's first two proper studio albums hardly match the greatness of later works like Red Mecca, 2 X 45 and even 3 Crepuscule Tracks", while noting that Mix-Up "only helped solidify Cabaret Voltaire's status as an integral part of the extended frisson of 1978–1982 post-punk".

[1] All tracks are written by Cabaret Voltaire (Chris Watson, Richard H. Kirk, Stephen Mallinder), except as noted