Bitmap Mask Alpha

class Example extends Phaser.Scene
{
    constructor ()
    {
        super();
    }

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
        this.load.image('bunny', 'assets/sprites/bunny.png');
        this.load.image('backdrop', 'assets/pics/platformer-backdrop.png');
        this.load.image('mask', 'assets/pics/mask.png');
    }

    create ()
    {

        const backdrop = this.make.image({
            x: game.config.width / 2,
            y: game.config.height / 2,
            key: 'backdrop',
            add: true
        }).setScale(2);

        const mask = this.make.image({
            x: game.config.width / 2,
            y: game.config.height / 2,
            key: 'mask',
            add: false
        });

        const bunny = this.make.sprite({
            x: game.config.width / 2,
            y: game.config.height / 2,
            key: 'bunny',
            add: true
        });

        bunny.mask = new Phaser.Display.Masks.BitmapMask(this, mask);

        this.input.on('pointermove', function (pointer) {

            mask.x = pointer.x;
            mask.y = pointer.y;

        });
    }
}

const config = {
    type: Phaser.WEBGL,
    parent: 'phaser-example',
    width: 640,
    height: 480,
    scene: [ Example ]
};

const game = new Phaser.Game(config);
                        

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