Ember is building multiple mid-core mobile/social games for iOS, Android, and Kindle Fire.
Our first game, "Towers N' Trolls" has been downloaded nearly 2 million times with no marketing spend, and has a consumer rating of 4.7 out of 5.0. It is already profitable.
Our next project "Tower Nation!" is a further evolution of our first product. We are taking the core mechanics that people loved in "Towers N' Trolls", and wrapping a recurring revenue city building meta game around it.