Orbital Movement

PlayerMovement.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    Vector3 planetDir; 
    float pull = 1; // away or towards planet / 1 or -1
    Rigidbody2D rb;
    float movement;// horizontal input

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

    void Update()
    {
        planetDir = Vector3.Normalize(transform.position); // direction
        Debug.DrawLine(transform.position, Vector3.zero, Color.red); // debug line
        transform.up = planetDir;//always look at the planet
        if (Input.GetKeyDown(KeyCode.Space)) pull = -pull;//swtich pull - positive to negative
        movement = Input.GetAxis("Horizontal");//left right input
    }

    private void FixedUpdate()
    {
        rb.AddForce(planetDir * pull * 200);//planet pull
        rb.AddForce(transform.right * movement * 300);//movement dir
    }
}