[2] Intruder is a concept album with an apocalyptic theme, and the point of view of an anthropomorphised Earth's anger towards its human inhabitants due to environmental degradation.

[3] “The planet sees us as its children now grown into callous selfishness, with a total disregard for its wellbeing, it feels betrayed, hurt, and ravaged.

[11] Riff Magazine said the album is "a science fiction soundtrack about the impending climate catastrophe that doesn't need a movie to get its urgent point across.

"[12] A number of the reviewers noted that Intruder was a sequel to his previous album both musically (with a similar blending of synthesizer-heavy Industrial rock with elements of middle eastern music, (the latter notably including contributions by Gorkem Sen playing the Yaybahar[13])), and also by theme, which is a "complementary narrative" to Savage (Songs from a Broken World).

On 27 May 2021 an exclusive 'Alt Mix' of Saints and Liars was made available from the official store to people who had preordered the digital version of that album.