Maybe unicorns shoot you, pegasus charge at you and alicorns are like bosses.
Then the mane6 are like minibosses, except Twilight, and you can also get the mare gun.
It could kind of work out with the right mechanics, maybe
Like you could make some ponies take more than a feew boops to cum
Also it would be pretty hard since your only weapon is your hand..maybe make a giant pony thats really hard to reach to boop