Altere o faser de rotação

function preload() {

    this.load.image('atari', 'assets/sprites/atari130xe.png');
    this.load.atlas('atlas', 'assets/atlas/megaset-0.png', 'assets/atlas/megaset-0.json');

}

function create() {

    atlasFrame = this.add.image(300, 100, 'atlas', 'dragonwiz');
    singleImage = this.add.image(300, 300, 'atari');

}

function update() {

    atlasFrame.rotation += 0.01;
    singleImage.rotation += 0.01;

}
Himanshu Jangid