I'm much more interested in this being a kid's game than a game for bronies ... so I would very much appreciate any specific examples you can give me so I can fix it.
Okay, first a disclaimer. Now that I'm reading through the document for the purpose of finding "offenses", I may be overly critical. I'm pointing out anything that draws my attention.
Except for a few strong examples, a lot of it might also be that I'm a brony myself. So I recognize some of the shoutouts. Stuff like "The story you tell is explicitly a fantasy or faerie tale (you can call it a pony tale if you’d like, but your friends will probably throw things at you)", which seems like a reference to MLP punning. And the name of the Charity move "The Pony Everybody Should Know" is just gratuitous :).
The strong examples are mostly stuff that ties to closely to the Apocalypse Engine. This stuff seems either target at adults, or inappropriate for minors.
- You might want to find another name for the GM than Master of Ceremonies. Or at least drop the MC moniker.
- "If that made you immediately think ‘Final Fantasy only with ponies as the heroes’..." I might be mistaken, but Final Fantasy might not be well known among your target base
- The entire section "This game is Powered by the Apocalypse!" You mention a long list of games, and then say "but these are for adults".
Stuff with overt brony feel
- I might just be overly critical, now that I'm reading stuff with this in mind, but the title "All The Pretty Little Horses" seems a bit like the faux-cutesy-girlyness that a brony might take on, to show he isn't afraid of girly stuff. At least, the title doesn't make me think of ponies going on adventures, defending the world against evil.
- This is echoed in the line "You should play this game because all the pretty little horses are awesome, simple as that." in the "But why should we play?" section
- The paragraph about the Handsome Haunchmark kinda have the "boys who don't like girly things are stupid" smell as well.
Something else I noticed, not related to the target audience thing:
Instead of explaining how the ponies look in the "On The Humble Race of Ponies" section, you might want to simply let your pictures talk. I'm not sure if it adds anything to explain in words that unicorns have "split hooves like a goat’s, and a thin tail ending with a tuft of soft, mane-like hair". I don't think everyone will be imagining the ponies correctly from being read the description. But if all the pictures show of the ponies, then you can see what they look like.