// works with either text or an image/sprite
// const button = this.add.text( 100, 100, 'Click me!', { fill: '0f0' })
const button = this.add.sprite( 100, 100, 'button')
    .setInteractive()
    .on('pointerdown', () => button.setScale( 1.1 ))
    .on('pointerup', () => button.setScale( 1 ));