void Update()
    {
        var rigidbody = GetComponent <Rigidbody>();
        var velocity  = rigidbody.velocity;

        //  Input.Axis
        var leftStick = JoystickManager.GetAxis();

        velocity.x = leftStick.x * moveSpeed * Time.deltaTime;

        //  Input.GetButton
        if (JoystickManager.GetButtonDown(0))
        {
            velocity.y = jumpVelocity;
        }

        rigidbody.velocity = velocity;
    }