I feel like a little more could have been done with game play. Maybe a pinch of combat, or a little more involving puzzles other than "get this go here". Music was amazing, it set the mood very well alongside the visuals.
One final note:
This is practically begging for a sequel. Who is Ruby? Why cause the villagers to abandon her? Is this what happens when any pony grows up without a Cutie Mark?
Too much is being left unanswered, which is the beauty of this game. Leave it as a stand alone game, it's fine as it is. If you do decide to make a sequel, tread lightly as sequels have a tendency to either suck or be awesome.