First, just a simple thing: "And I rise" in the first verse is sung to an ascending melody (D E F), musically representing that "ris[ing]."
More significant is the vocal melody during this section:
We burst a pretty balloon, took us to the moon
Such a beautiful thing, but it's ended now
And it sounds like a lie
I said I'd rather die than be without her
The melody rises (almost a full octave: from F# to F) from the beginning up until "but it's ended" and then falls from "ended now" onwards. The descent skips around a bit (the lowest note is a B), but generally it goes from F to C. The ascending melody musically portrays the happiness of going "to the moon" and the "beautiful thing," and the descending melody the sadness of "it's ended now" and the singer/speaker's change in mood.
