 Jon O'Brien from AllMusic considered Katy's vocal performance to be of a neo soul nature.Written by sly seduction, it references spellcasting and wizardry in order to lure her love interest.Alex Denney of music publication "NME" deemed its beat "strident" and compared its synthesizer arrangement to sounds from a pinball machine, though he had a slightly more polarized reaction to the song's "hackeneyed arena-rave"-based chorus.