A Serious Game AS SIMPLE AS POSSIBLE

Hello, I would like a Serious Game (SG) created on the Greenfoot platform. The player should learn playing, take rewards for learning achievments and the game is getting more and more difficult as the levels increase. THE GAME SHOULD BE AS MINIMAL AND SIMPLE AS POSSIBLE. For example, a 2d game with leveling and some starting screen, it can be a learning-code game or learning basic math equisions which get harder or sth else.. I am open to ideas, the easier and the cheaper will be selected. More information about Serious Games in the attachment. Please bid and tell me your idea. A small report of the game and its learning attributes is required and also a small documentation with a class diagram with a quick description for the most used classes. Thank you a lot