When you develop a game you're taking a big risk. There are so many ways people can entertain themselves that your game has to be something really special - and even that may not be enough. Secondly, ripping off the letterpress UI (with or without permission) was a bad idea imo. If I saw the screenshots my first thought would be. "this is a letterpress ripoff" and I wouldn't have downloaded it.

If you create an app that solves a real problem or solves a problem better than the current solutions you can do okay in the App Store. It's rare to do great but you can do well enough. Games don't solve problems. They add to a growing number of ways to entertain ourselves which includes movies, music, tv, news, the internet - and all these are accessible on a mobile device.

P.S. Not trying to sound too negative about games but making money in entertainment is difficult. People have so many options - many of which are free - and they'll take the cheapest one.