[1] Killa Season garnered a positive reception but music critics were mixed toward Cam's choices in production and lyrical content compared to Purple Haze.

"[3] AllMusic editor David Jeffries said that the album was in need of a rewrite on some tracks but still found it enjoyable with memorable hooks and for showing a vulnerable side in Cam, concluding that "Killa Season would have benefited from trimming and better planning, but those things are extremely rare in the world of Dipset.

"[2] Steve 'Flash' Juon of RapReviews praised the album for continuing Purple Haze's formula with tight wordplay and loose soul sample production, despite containing tracks that were Dipset holdovers, concluding that, "Nonetheless Cam fans should be happy with Killa Season, an album which continues his recent trend of solid (if somewhat unspectacular) solo CD's.

"[6] Jayson Greene of Stylus Magazine found some of Cam's lyrics humorous at times, but found the production and guest artists lacking in variety in terms of go-to names, concluding with "Instead, Killa Season is a retreat, an album to satisfy the converted but one that will keep his mythical status confined to the 12-mile radius of his Manhattan home.

"[8] Pitchfork writer Ryan Dombal felt the album was a disappointment compared to Purple Haze, finding the production lacking in energy and in need of more humorous songs ("I.B.S.")