Bradley Stern of MuuMuse called Inna a "solid supplier" and "damn prolific", praising her decision to issue a completely new body of work with Heartbreaker and not stretch it out by not adding the previously released non-album singles to its tracklist. Stern further applauded the album's release strategy as a "power move", and jokingly concluded: "[The album] came right after [Spotify's] #Wrapped2020 happened. I will be launching a Change.org petition to have Spotify recount the votes immediately." Running for approximatively 30 minutes, Heartbreaker consists of EDM, Middle Eastern and Latin-influenced dance-pop songs that are written in both English and Spanish. The album opens with the Arabic music and reggaeton-inspired "Maza Jaja" and "One Reason", with Stern commenting that the latter is "bound to be on heavy rotation at my Russian barbershop in Midtown that solely blasts deep house dance hits".
