[7] Frontman Wilbur Soot, real name William Gold, revealed the EP had taken over a year to complete,[8] and that the track "Perfume" originally did not make the final cut.

[10] Critics found Pebble Brain's lyricism to concern two main themes – relationships and politics.

[11] "The Fall", written about the "wealthy upper class", stood out to reviewers for its "higher emphasis on the dark bass to the lyrical message to [Gold's] speech at the end, an awe-inspiring mix between spoken word and rap".

[14] In terms of production, the EP was criticised by some outlets for issues with mixing, with one explaining "the lead singer's voice is sometimes hard to hear over the high-energy drums and guitar".

[16] Timothy Monger of AllMusic wrote Pebble Brain features "improved production value" compared to their debut, concluding "[Gold's] song subjects are sometimes as frenetic as the band's delivery, but are often quite enjoyable".