Pony Friends: Mini Edition is just a newer version of an existing game, the rules and game play are almost the same but there are a few added extras. The aim of the game is to take care of a pony keeping him healthy and in good condition, the usual idea for a virtual pet game. The fact that in this case it inviolves a miniture breed is of no real consequence, it just makes it perhaps a bit more appealing to younger kids.
The first thing you do is to create a look for your pony from many available bits and pieces. You can decide everything from its hair, body, head, legs and other physical features of the pony.
There is really nothing in this game to set it apart from any other virtual pet game, just a different animal and will accordingly only have an appeal to young girls.