Developer Ngmoco, known for popular games such as Rolando and Star Defense, is reportedly planning to shift to a “Freemium” pricing model for its game lineup, doing away with charging up front for titles. Already found in games such as Eliminate and Touch Pets Dogs, the free-to-play approach gives away the games for free and relies on in-app purchases to generate revenue by selling additional content and power-ups within each game. In…