Edmonton Journals Julia LeConte gives a positive review of the release, calling it, "a smartly written seven-song EP that offers up a smorgasboard of indelible hooks," and goes on to say her song creating ability matches her "spectacular" voice. The editor of
Pressplay says that thematically,
CollXtion I, isn't much, but that the whole package is a knockout. The editor goes on to describe the content as, "songs that belong in the charts, and it's only a matter of time before the world takes note." Ryan McNutt of
Exclaim! says
CollXtion I finds its place in its opposites, from its simultaneous "clinical coolness," to "warm and present immediacy," and her "familiar yet foreign," vocals. Overall he says it is a "confident, catchy debut," with "earwormy flourishes along the way." Jean-Luc Marsh, hailing from Pretty Much Amazing, gave a slightly less than positive review, saying that, "X has an occasional knack for pop at its saccharine, venomous best." He says her only misstep is, "Good, which hangs inoffensively but unceremoniously." On a more positive note, he added that, "she makes up for it with an impassioned performance on closer 'Sanctuary,' packing a platitude-laden vocal wallop." Joshua Bote of
The Daily Californian said of her September 2015 live performance at Rickshaw Stop of the songs from CollXtion I, "Her nearly flawless performance left a gaping hole where Allie X's identity should have been." Bote also stated, "she launched into tune after tune from CollXtion and consistently maintained the awkward rigidity of her semi-dancing, semi-flailing routine. Each number was flawlessly performed, but her set lacked an identifiable persona that set her apart from any of the Top 40 divas." Upon the release of
Catch, Jamie Milton of
DIY Magazine says, of Allie X and her single, "Allie X stepped on the scene like a bottle of wine at a wedding - everyone wanted a piece of her." TIME's Jasmine Cox complemented the track, saying it "shines with a level of polish and craft that's remarkable," and complemented X's "attention to detail." Logan White of Billboard magazine called
Catch "an expertly crafted, remarkably vulnerable synth-pop showcase." Melissa Locker of TIME called the song "an injection of sparkly synth-pop that's so catchy. it [sic] reminds you of why pop songs are called infectious in the first place." "Bitch" was described as, "brimming with bubbly bleeps and sonic squelches," and as highlighting "Ms. X's dream-like vocals," by Robbie Daw of Idolator. Popjustice said, "Allie X is one of the best new entities in all of Pop," going on to say that "Bitch" is a "bit noisier than 'Prime' and 'Catch' but no less amazing."
Exclaim! named the EP the 10th best EP of 2015. ==Track listing==