Move player on planets in unity 2d code example

Example: Move player on planets in unity 2d

/*Hey, I found this script on reddit after hours of searching,
It allows you to move left and right (A & D) on any sized 2D planet, 
There aren't any jump mechanics tho.*/

//Gravity Attractor, scrpit attached to the planet:
public float gravity;

public void Attract(Transform body)
{
    Vector2 gravityUp = (body.position - transform.position).normalized;
    Vector2 bodyUp = body.up;
    
    Rigidbody2D rb2d;
    rb2d = body.GetComponent<Rigidbody2D>();
    
    rb2d.AddForce (gravityUp * gravity);
    
    Quaternion targetRotation = Quaternion.FromToRotation (bodyUp, gravityUp) * body.rotation;
    body.rotation = Quaternion.Slerp (body.rotation, targetRotation, 50 * Time.deltaTime);
}

//Gravity Body, script attached to the player:
public GravityAttractor attractor;
private Transform thisTransform; 
private Rigidbody2D rb2d;

void Start ()
{
    rb2d = GetComponent<Rigidbody2D> ();
    thisTransform = transform;
}

void Update () 
{
    attractor.Attract (thisTransform);
}

//Player Controller, script attached to the player:
PlayerController public float moveSpeed = 15; 
private Rigidbody2D rb2d; 
private Vector2 moveDir;

void Start()
{
    rb2d = GetComponent<Rigidbody2D> ();
}

void Update () 
{
    moveDir = new Vector2 (Input.GetAxisRaw ("Horizontal"), 0).normalized;
}

void FixedUpdate ()
{
    Vector2 globalmovedir = (transform.TransformDirection(moveDir));
    rb2d.position += globalmovedir * moveSpeed * Time.fixedDeltaTime
}