In his book
Cardiacs: Every Album, Every Song, Eric Benac says "Bellyeye" "showcases Tim's strong
pop songwriting instincts and his love of dark lyrics". Benac opined that the production and
arrangement of "Bellyeye" "could only have come from this particular Cardiacs album", but that the song is "poppier and straighter than normal" and "wouldn't be out of place on a Blur album." Benac noted the song's
melodic bass and "clear and easy to follow" vocals by Tim Smith. Regarding the song's lyrics, which contain the concept of saving or being saved, Benac suggests the singer is "a troubled person" at wit's end who "can't seem to handle life's demands" and "always looking out for people in trouble with an 'Acme Thunderer Blaster' to help", tying the idea of a saviour to a
superhero or "that of the
comic book shaped cruisaders". An alleged demo uploaded to YouTube has an arrangement of mostly piano and drums with light guitar and some horns, which Eric Benac said "isn't as rich as the album version". He noted that Tim Smith's "chords and playing obviously influenced the final take." In a review of the 2014 release of
Sing to God by Sam Shepherd of
MusicOMH, Shepherd called "Bellyeye" an example of Tim Smith's "keen pop nous" which, along with "Manhoo" illustrates the debt that Blur owe Cardiacs.
The Quietus Sean Kitching said the song "clearly illustrates why Cardiacs were such an influence on bands like Blur to begin with", calling it "Smith's attempt at a slightly straighter pop song – totally euphoric like filling the cup of joy until it’s completely overflowing". Describing the single release, Org Records said "Where do you think
Mr. Bungle, Blur or a million others get all their best ideas?"
The Guardian's Pete Cashmore called "Bellyeye" one of "Cardiacs’ most sensible moments" along with "
Is This the Life" and "Feeding the Plankton", opining that a compilation of such moments "would be a pure pop classic". Marco Sgrignoli of the Italian music publication
Ondarock called "Bellyeye" a "kaleidoscopic and bombastic" composition, "fatally catchy" despite its "stainless obliquity". ==Track listing==