My app isn't working after I bought it. I start to play, but it exits. Why?

I just bought two apps with a gift card I purchased. They both work dine until I click play. It goes to the loading screen, and then exits the app. I would like to know why, and i it isn't fixed, I would like a refund of five dollars. That was the price of the two games combined. The apps were Five Nights At Freddy's 1 and 2. My iPod is generation 4.