In ~70 lines, you have a Mario-like platformer with live code in the browser! https://elm-lang.org/examples/mario
You could use the turtle example as the basis for a racing game: https://elm-lang.org/examples/turtle
And there's even a WebGL implementation for 3D graphics! https://elm-lang.org/examples/first-person
> Another issue I'm facing is that we are French. It's a requirement for us to use resources in French for now as he improves his English along the way.
The Elm Europe community seems to be pretty large. I'd try reaching out to them and see if anybody has French resources.