characterController.cs

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

// Add to player gameObject
// from https://www.youtube.com/watch?v=blO039OzUZc

public class characterController : MonoBehaviour {

    public float speed = 10.0F;

    void Start()
    {
        Cursor.lockState = CursorLockMode.Locked;
    }

    void Update() {
        float translation = Input.GetAxis("Vertical") * speed;
        float straffe = Input.GetAxis("Horizontal") * speed;
        translation *= Time.deltaTime;
        straffe *= Time.deltaTime;

        transform.Translate(straffe, 0, translation);

        if (Input.GetKeyDown("escape"))
            Cursor.lockState = CursorLockMode.None;
    }

}