Will you comment on "The dance of the fireflies"?

Of course, Iano is right about the possessive form of the common noun moon, as you have subsequently recognized. The apostrophe can be used either in contractions or in forming possessives, and we discern the authors intent from the context... your context speaks unequivocally. I liked your poem in most regards, but not the line "Briefly insane" because it doesn't seem, to me at least, to work well with the rest of the poem; even something like "All that remain" seems, to me, better. As for metrical concerns, it reads reasonably smoothly when I scan it, but I don't like your penultimate line. What if you had terminated the previous line with an em dash and then concluded your poem with "Catch a ride home / On a falling star." That seems more in keeping with the flow of your poem. These are small matters, and indeed matters for debate, but accept my suggestions in the spirit they are offered, viz. to make a relatively strong effort perhaps even a little better. The choice is entirely your own in the final estimation.