A relatively fun level-up game.
But the characters you've chosen for the story is weird.
You should forget about the "My little Dashie" fan fic and just make this an all out Pokemon themed battle.
Where you collect ponies and raise them. You start off with the one you choose. Secret ones that could be discovered is a Doctor Whooves or a Derpy.
What disappoints me is the lack of attacks and animation. But you've got the right idea.
Build up on this idea, cause leveling up is fun.
But don't make leveling up too cumbersome. It's not about repeating battles but knowing the right strategy for each enemy.
Have the main character be 'Megan' or 'son of' or something.