Yesterday CaptainHoers, of Firestarter Spitfire fame, voiced his view on a few of the darlings in the Pony games world, Ambient, Fallout Equestria and Horse Game. He makes some good points with an appropriately sceptical outlook and a focus on the game design. What makes them work, where do they fall flat and how do they compare. Split into the sections of introductions, the looks, mechanics, the scope of the projects and briefly rounding it with how their states could be improved, he does get well around the subjects.

Give it a watch, form an opinion, learn something and... I dunno, make a game of your own. The community could always need more pony games. Cheers.