Geoff Andrew in his "Time Out" review said "Low budgets give little reason for regret when the often tacky effects are surrounded by so much imagination, good humour, and sheer joy in film-making as here. "Not of This Earth" is a minor sci-fi gem, with an alien (Birch; you can tell he's an ET by his briefcase and dark glasses, establishing him as infinitely superior to the moronic middle Americans on view) terrorising Earth (or a small backlot) in his quest for blood for the folks back home".