Several of the games are broken, namely Sweetie Belle's and Pinkie's. If you miss even once with Sweetie's, you can't complete the game (any ball past the 10th won't spawn).
Pinkie's outright crashed the game during the tutorial, and the instructions aren't very clear.
This game needs some serious work.
That said, the artwork is decent. Applebloom and Scootaloo's games, while not difficult, are enough to wake up a groggy brain. I'll give you credit for that. It's just not enough to overtake the literally game-breaking bugs I've encountered. I would suggest adding in a 'lives' counter, as missing even one green heart will result in a failure. It's a bit too intensive.