Hello Alix, to properly integrate the PhaserInput plugin you need to add it to the game object:
In your own example try adding this line:
game.add.plugin(PhaserInput.Plugin);
as the first line of the bootstrap init function (RenJSBootstrap.js, line 7). This is not an official addition to RenJS but just a quick example I did for someone that asked for it, so it's not perfect and I don't know if any other unexpected bug could appear.
In any case, I updated also the example repository and it should work now.