It is well-known that educational games often suffer from a complete no-alignment between game narrative and educational goals. Whilst the last are tied to curricular specifications and, in many times, inspired in textbooks and conventional exercises, narratives are meant to lead the player/student to the flow state. However, in educational games, such a state only is reached trough the combination of both, which is barely obtained by most of them. In this sense this paper proposes a foundational set of good practices for Educational Game Design, aiming to serve as a conceptual framework to support game designers, content creators and teachers/professors in this intrinsically multidisciplinary task, which is to seamlessly integrate narrative elements with game mechanics, dynamics and learning goals.