MovimientoDelHeroe.cs

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

public class MovimientoDelHeroe : MonoBehaviour {
  [Header("Initialization")]
  public Camera cam;

  [Header("Information")]
  public float speed = 30; // m/s

  void Reset () {
    cam = Camera.main;
  }

  void Update () {
    Vector3 right = cam.transform.right;
    Vector3 forward = cam.transform.forward;

    right.y = forward.y = 0;

    transform.position +=
      ( right * Input.GetAxis("Horizontal") +
        forward * Input.GetAxis("Vertical")) * speed * Time.deltaTime;
  }
}