I have got several store credits for bad purchases, so I know it is possible. Just a couple weeks ago, I bought a song, through my own negligence, which wasn't the song I wanted, and I still got store credit for it. The same for apps that didn't work.
I didn't purchase Uno because of the reviews that mentioned bugs. However, look for MotionUno, I believe is the name. Same game, we've found only one bug that didn't stop our enjoyment of it. You can purchase the client for iPad, and use your iPhone, if you have it, as your hand. Played several games of it the other night, using iPhones, and it was quite enjoyable.