I used Aseprite to make a simple image for the game and walked them through how layers can form an animation.
I've created the repo:
I started them off learning about functions and few other things, and then showed them how people coded before jQuery. Then the stages of using selectors to wire up a page, then finally a bit of VueJS.
I let them implement a feature autocollector which collects coins from the pinniped and look at fixing bugs.
I don't think I'll be spending much more time on the repo, but they might be adding features at a later date.