Étincelles means 'sparkle' or 'twinkle'. It's a beautiful and evocative word that paints a vivid picture of light and brilliance.
In the song, Amir sings, "Dans mes pupilles, tu étincelles" (In my pupils, you sparkle). He uses this word to describe the captivating effect of the person he's singing about, suggesting their presence brings light and magic to his world, much like a supernova.
Amir's "Supernova" starts with a shy guy at a party, totally smitten by someone he sees. He's so captivated, he thinks she's a "Supernova qui habite mes pensées" [Supernova who lives in my thoughts]. He's a bit of a romantic, already convinced "Que toi et moi, on est faits pour s'aimer" [That you and I are made to love each other] and he's terrified of her disappearing. He's so focused on her that everyone else fades away, "Avec toi, j'me sens seul au monde" [With you, I feel alone in the world].
But then the mood shifts dramatically. The party atmosphere of "On voulait juste faire la fête" [We just wanted to party] turns into a frantic "Courrez, courrez" [Run, run]. Something bad happens, and suddenly, it's "Il n'est plus l'heure de faire la fête" [It's no longer time to party] and "Pour s'embrasser, il est trop tard" [It's too late to kiss]. The song ends with a powerful message about music being a "safe space" and what happens when that's violated, making the earlier romantic longing feel heartbreakingly cut short by an unforeseen event.