The phrase 'I love you to the moon and back' tends to be well used in parent/child relationships, as per the gorgeous 2015 book by Amelia Hepworth, an international classic - perhaps relaying this message to a romantic partner might be felt more with the added nostalgia of your early years.
I have to admit that I'm a bit of a production snob and often pick holes in how songs sound, but I have nothing to say about how this song could be improved. It FEELS complete, and it's exciting to hear something so refreshingly excellent in its production. Top marks all round.
Hear more love songs like this on our Love is in the Air Playlist: