Gibt es da irgendwelche Programme?

Danke!

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

public class Player_Move : MonoBehaviour
{
  public float speed;

  Rigidbody2D rb;

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

  void Fixedupdate()
  {
    float move = Input.GetAxis("Horizontal");
    rb.velocity = new Vector2(speed * move, rb.velocity.y);
  }
}

Warum funktioniert das Skript nicht?