I upvoted just to spite you, you meanie.
In all seriousness, though, I like the opening. It feels so melancholic, yet deliciously hopeful. I'll gladly read the rest of what you have here.
Also.

Soon, Sunset and Twilight's friends were gaining metaphysical abilities and every other weekend there was some bizarre phenomenon that they conquered or otherworldly villain that they combatted.

Magical Girl Flash Sentry when?

This is going to sound silly but what sold me on this Flash and made him feel less like an author Mary Sue was the prologue's description of him with the hairbrush handle. That's such a weirdly personal anecdote that doesn't make him more of a Mary Sue but just a curious kid who did something that probably felt shameful and silly. And weird, embarrassing childhood stuff is is relatable to most of us.

Alrighty, not sold much on the premise, but you are my favorite show in this circus. I'll give it a good olde college try.