Animal Warfare for Android
The player gathers an army of different animals. You can hire them for gold, which you can get for killing enemies and performing quests. The playing field is minimalistic: there is nothing on it except for the background. When merging two identical units, you can get a more advanced version of the animal.
In the course of the game, new animals with their abilities become available. In total there are about 100 levels of the game. There is also a training mode, where the enemies attack continuously. In some levels there are bosses.