Video Game Creation Curriculum

Am seeking a video game creation curriculum or advice on how to create that curric for levels 7 thru 12. I have a developed Scratch unit. These lessons would use technologies like Game Salad, sploder.com, and codea. Thinking rigor could be wrapped in a UbD model. Technically, game creation is pretty intuitive for the students so need to introduce higher order and critical thinking into the process.

Thanks.