The game has a lot of potential, the battle system already has some form, but it's a little too simple now, add some multipliers (defence bonusses, weaknesses, hit and miss, etc..)
I did like the ap system, which kind of is the agility or stamina of the characters.
The most important part, though, will be the story, mlp has it's success thanks to strong plots and deep characters, make sure this game does NOT miss this, or it'll never succeed despite a soundly built engine. So for this you have yet to earn your 5th star :)