There are seven variables that you can modify in order to easily adapt the behaviour of the Gulp file to your own needs.
PHASER_PATH path to the Phaser build folder, change if using Bower or other package managers.
Default: ./node_modules/phaser/build/
BUILD_PATH your build folder's path, change it if you wish to rename the default folder.
Default: ./build/
SCRIPTS_PATH should be contained inside the build folder, used to store Javascript files.
Default: BUILD_PATH + '/scripts'
SOURCE_PATH your source code folder's path (the place where all your ES6 files are located).
Default: ./src
STATIC_PATH your static files folder's path (the place where all your HTML and CSS is located).
Default: ./static
ENTRY_FILE the main source file, by convention named index.js.
Default: SOURCE_PATH + '/index.js'
OUTPUT_FILE the name of the output transpiled file.
Default: game.js
Any other modification must be done manually to the correct Task.