JavaScript in browser game

I am looking for a freelance developer to build the first levels of an in browser JavaScript educational game (prototype) that could be accessible on mobile devices (e.g. tablets, mobile phones) as well as computers. The developer will receive wireframes and all the necessary graphics. Some work has already been done on the main functionality of the game. I am looking for someone to extend & add to the work that has already been done and build the first 5 levels of the game. The main functionality of the game includes: - Dragging and dropping of objects/numbers on the screen - Implementation of maths rules (e.g. can't add before multiplying) - Implementation of scoring and rewards system - Implementation of feedback elements (e.g. shaking objects) - Extra work could require - implementation of basic character animation (moving eyes, happy/sad)