How do I rotate my player object so it faces my mouse in Cocos Creator

Question

I want to make it so my player object faces my mouse so he can shoot stuff. So far with the code I have it just rotates wonky and wrong. What am I doing wrong?

    onMouseMove(m:EventMouse){
    var facing = new Vec2(
        m.getLocation().x - this.node.getPosition().x, 
        m.getLocation().y - this.node.getPosition().y);

    var angle = Math.atan2(facing.y, facing.x) * 180 / Math.PI;   

    this.node.setRotationFromEuler(new Vec3(0, 0, angle));
}