2D World Conquest Mobile Strategy Game

I want to develop a simple 2D mobile strategy game for iOS (Android optional later) where the player controls a country on a world map and tries to conquer all other countries. The game should be offline and single-player, focused on simple and fun gameplay rather than complex simulation... (Budget: $10 - $30 USD, Jobs: 2D Game Art, App Store Optimization, Artificial Intelligence, Game Design, Game Development, Game Testing, iOS Development, iPhone, Mobile App Development, Unity)