Michael of Scene Point Blank called the album a "dynamic adventure in music," and gave it four stars out of five. He said, "Balboa and Rosetta both deliver the goods on Project Mercury, but I found the Rosetta tracks to be a bit more deserving of praise."[4] In a review for Punknews.org, Brian Shultz gave the release three and a half stars out of five. He praised Balboa's tracks, calling "Planet of Slums" "some of the most ambitious and emotional hardcore you can find hanging around." He went on to say, "Balboa manage to reinvent themselves a bit with their anguished arts of Envy-like work, and Rosetta offer some prolonged pieces of guitar-heavy ambience. For those who follow the style closely, this should be a hell of a treat."[3] In Jason Jordon's review for Last Rites, he gave the album a 7.9/10 rating. He wrote, "Project Mercury features a...curious partnership between Neur-Isis-inspired [sic] Rosetta and the political, post-hardcore outfit Balboa. Somehow, the marriage flourishes."[2]
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