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        if(_gameOverText != null) { 
            _gameOverText.gameObject.SetActive(true);
            _scoreText.gameObject.SetActive(false);
            _gameOverText.text = "Game Over!";
        }

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public class Enemy : MonoBehaviour
{
    private float _speed = 4.0f;
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame

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public class SpawnManager : MonoBehaviour
{
    [SerializeField]
    private GameObject _enemyPreFab;
    private bool _stopSpawning = false;
    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(SpawnEnemy());
    }

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        if(collision.tag == "Player")
        {
            if(_player != null)
            {
                _player.Damage();
            }
            
            Destroy(gameObject);

        }

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    private void OnTriggerEnter2D(Collider2D collision)
    {
        if(collision.tag == "Enemy")
        {
            
                Destroy(this.gameObject);
            
        }
    }

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    [SerializeField]
    private GameObject _shield;
    [SerializeField]
    private bool _isShieldActive = false;

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 if(_isShieldActive == true)
        {
            if (_shield != null) { 
                _isShieldActive = false;
                _shield.SetActive(false);
            }
            
        }

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    public void ShieldsActive()
    {
        if(_shield != null) { 
        _isShieldActive = true;
        //enable shield visualize
        _shield.SetActive(true);
        }
    }

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  private void OnTriggerEnter2D(Collider2D other)
  {
          if (other.tag == "Shield")
        {
            Destroy(gameObject);
        }
   }

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

public class SpawnManager : MonoBehaviour
{
    [SerializeField]
    private GameObject _enemyPrefab;
    [SerializeField]
    private GameObject _enemyContainer;