Instantiated object not receiving value from parent class

Hey,

I'm trying to make an instantiated object "enemy" move with the speed "moverEnemySpeed" set in the parent class. I don't get any errors indicating the child script can't find moverEnemySpeed, but when I Debug.Log it's value it says "0". In the parent script I set the value to 5...

Anyone know what I'm missing?

Parent class:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SpawnerController : MonoBehaviour 
 {
     //The Spawner game object manages the instantiation of the enemies 
     // Array of GameObject prefabs set in the Engine/Inspector
     public GameObject[] mode;
 
     // Spawntime settings
     public int spawnInterval;
     public float startWait;    
     
     public float moverEnemySpeed;
 
     
     // Runs on start-up game
     void Start () 
     {
         moverEnemySpeed = 5f;
         
         //Repeats a function on declared start-up time startWait and with set interval spawnInterval
         InvokeRepeating("Spawn",startWait, spawnInterval);    
         
         
     }
 
     //Spawns the enemies
     void Spawn () 
     {
 
         //Randomises a spawnposition along the x-axis
         Vector3 position = new Vector3(Random.Range(-3.0f,3.0f), 0, 8.0f);
         
         //By default the enemy planes are standing upright and invisible for the top down camera, rotating them 90 degrees on creation fixes that
         Quaternion spawnRotation = Quaternion.Euler(90,0,0); 
         
         //Picks a random enemy from the array and instantiates it in the game 
         (Instantiate(mode[Random.Range (0,mode.GetLength (0))],position, spawnRotation)  as GameObject).transform.parent = this.transform;
     }
     
 }

Child class:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Mover : SpawnerController 
 {
     //This script is applied to all instantiated enemy player to make them move downward the screen
     
     //Rigidbodies are needed to move the enemy
     private Rigidbody rb;
     
     // Runs on startup game
  void Start () 
     {
 
         rb = GetComponent<Rigidbody>(); //Gets the Rigidbody component
         
         rb.velocity = -transform.up * moverEnemySpeed; //Starts movement of enemies
         Debug.Log(moverEnemySpeed); 
     }
 
 }