PlrHealthSystem.cs

using System;
using TMPro;
using UnityEngine;

public class PlrHealthSystem : MonoBehaviour
{
    private float health;
    public float maxHealth = 100f;
    public TextMeshProUGUI healthTextComponent;
    public TeleportSystem teleportSystemScript;
    public GameObject playerRef;
    public DestroyAllEnemiesScript destroyAllEnemiesScript;
    //

    public event EventHandler OnPlayerDeath;
    //https://www.youtube.com/watch?v=OUDBGiAiOqA


    private void Start()
    {
        health = maxHealth;
        healthTextComponent.text = "Health: " + health + " / " + maxHealth;
    }

    public float GetHealth()
    {
        return health;
    }

    public void AddOrSubToHealth(float amount)
    {
        float tempCheck = health + amount;
        if (tempCheck > maxHealth)
        {
            tempCheck = maxHealth;
        }
        if (tempCheck < 0)
        {
            tempCheck = 0;
            ResetPlayer();
            return;
        }
        health = tempCheck;
        healthTextComponent.text = "Health: " + health + " / " + maxHealth;
    }

    private void ResetPlayer()
    {
        health = maxHealth;
        healthTextComponent.text = "Health: " + health + " / " + maxHealth;

        teleportSystemScript.TeleportPlayerToLastSpawn();
        destroyAllEnemiesScript.StartCoroutine("DestroyAllEnemies");

        // waits till above
        OnPlayerDeath?.Invoke(this, EventArgs.Empty);
        // ? for checking null ref. like if I have this invoke but nobody listens
        // if I didn't have that ?, it'd throw an error for that case
    }
}