here is the script
using UnityEngine;
public class SimpleMove : MonoBehaviour
{
public float moveSpeed = 5f;
void Update()
{
Vector3 moveDirection = Vector3.zero;
if (Input.GetKey(KeyCode.W))
moveDirection += Vector3.forward;
if (Input.GetKey(KeyCode.S))
moveDirection += Vector3.back;
if (Input.GetKey(KeyCode.A))
moveDirection += Vector3.left;
if (Input.GetKey(KeyCode.D))
moveDirection += Vector3.right;
transform.Translate(moveDirection.normalized * moveSpeed * Time.deltaTime);
}
}