[1] In 2006, Nick Hannon spoke to Will Mecum of Karma to Burn, asking if he would be interested in coming to the United Kingdom to record with Sons of Alpha Centauri.

[4] Although the music contain no lyrics, the artwork, composed by Jimbo Valentine,[2] is visibly influenced by conspiracy theories such as the New World Order, the Moon landing hoax, the writings of Zecharia Sitchin, Anglo-American relations (including the Special Relationship) and mass surveillance.

"[4] Disagreement.net praised the collaborative Alpha Cat tracks, stating that they "link [the two bands'] genres which after all are not that dissimilar to make Last Day of Summer an incoherent listening experience.

"[14] Deaf Sparrow gave the album a mixed review, commenting that the Alpha Cat tracks "are scrambled in the sequence, perhaps as an effort to put both bands in the same plane.

"[6] RockFreaks.net were pleased with the album but did not find it unique, stating that "if you disregard the undeniable excitement that comes from realizing how this project approaches genius in the way that it has been put together, the songs aren't actually that amazing as standalone tracks.