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C#-Quelltext

using UnityEngine;
using System.Collections;

public class PlanetGravity : MonoBehaviour {

    private float gravityForce = -20;

    public void ApplyGravity (Transform receiver) {

        Rigidbody2D rb = receiver.GetComponent<Rigidbody2D> ();
        Vector3 dirPlanetToReceiver = (receiver.position - this.transform.position).normalized;
        rb.AddForce (gravityForce * dirPlanetToReceiver);

        Vector3 dirReceiverUp = receiver.up;
        Quaternion rot = Quaternion.FromToRotation (dirReceiverUp, dirPlanetToReceiver) * receiver.rotation;
        receiver.rotation = rot;

    }

}

C#-Quelltext

using UnityEngine;
using System.Collections;

public class PlanetGravityReceiver : MonoBehaviour {

    public PlanetGravity planetGravity;
    private Rigidbody2D rb;

    void Awake() {

        rb = this.GetComponent<Rigidbody2D> ();
        rb.gravityScale = 0;
        rb.freezeRotation = true;

    }

    void FixedUpdate() {

        if (planetGravity != null) {

            planetGravity.ApplyGravity (this.transform);

        }

    }

}

C#-Quelltext

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

    private Rigidbody2D rb;
    private float moveSpeed = 8;

    void Awake() {

        rb = this.GetComponent<Rigidbody2D> ();

    }

    void FixedUpdate() {

        Vector3 moveDir = new Vector3 (Input.GetAxis ("Horizontal"), 0, 0);

        rb.MovePosition (rb.position + new Vector2 (this.transform.TransformDirection (moveDir).x, this.transform.TransformDirection (moveDir).y) * moveSpeed * Time.fixedDeltaTime);

    }

}

C#-Quelltext

Vector2 moveDir = new Vector2 (Input.GetAxis ("Horizontal"), 0);
rb.position += new Vector2 (this.transform.TransformDirection (moveDir).x, this.transform.TransformDirection (moveDir).y) * moveSpeed * Time.fixedDeltaTime;