Movimiento en X con C#

using UnityEngine;
using System.Collections;

public class NickPlayer : MonoBehaviour {

Rigibody2D NickRB;
public float maxvelocidad;

// use this for initialization

void Start () {
  NickRB = GetComponent<Rigibody2d> ();
}

// Update is called once per frame
void Update () {
float mover = Input.GetAxis ("Horizontal");
NickRB.velocity = new Vector2 (mover * maxVelocidad, NickRB.velocity.y);
}
}