PlayerMovement.cs

/*
 *      Script par Valentin Bloch      
 *
 */

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    public float speed;
    private Rigidbody2D myRigidbody;
    private Vector3 change;

    // Start is called before the first frame update
    void Start()
    {
        myRigidbody = GetComponent<Rigidbody2D>();

    }

    // Update is called once per frame
    void Update()
    {

        change = Vector3.zero;
        change.x = Input.GetAxisRaw("Horizontal");
        change.y = Input.GetAxisRaw("Vertical");

        if (change != Vector3.zero)
        {
            MoveCharacter();
        }

        Vector3 pos = Camera.main.WorldToViewportPoint(transform.position);
        pos.x = Mathf.Clamp01(pos.x);
        pos.y = Mathf.Clamp01(pos.y);
        transform.position = Camera.main.ViewportToWorldPoint(pos);
    }
    void MoveCharacter()
    {
        myRigidbody.MovePosition(transform.position + change * speed * Time.deltaTime);
    }
}