HealthSystem.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

namespace RPG.Personagem
{
    public class HealthSystem : MonoBehaviour
    {
        [SerializeField] float maxHealthPoints = 100f;
        [SerializeField] Image healthBar;
        [SerializeField] AudioClip[] damageSounds;
        [SerializeField] AudioClip[] deathSounds;
        [SerializeField] float deathVanishSecond = 4f;       
        const string DEATH_TRIGGER = "Death";
        float currentHealthPoints;
        Animator animator;
        AudioSource audioSource;
        Character characterMovement;

        public float healthAsPercentage
        {
            get
            {
                return currentHealthPoints / maxHealthPoints;
            }

        } 

        void Start()
        {
            animator = GetComponent<Animator>();
            audioSource = GetComponent<AudioSource>();
            characterMovement = GetComponent<Character>();
            currentHealthPoints = maxHealthPoints;
        }

   
        void Update()
        {
            UpdateHealthBar();

        }

        void UpdateHealthBar()
        {
            if (healthBar)
            {
                healthBar.fillAmount = healthAsPercentage;
            }
        }
        public void TakeDamage(float damage)
        {
            bool characterDies = (currentHealthPoints - damage <= 0);
            //mata player
            currentHealthPoints = Mathf.Clamp(currentHealthPoints - damage, 0f, maxHealthPoints);
           var clip = damageSounds[UnityEngine.Random.Range(0, damageSounds.Length)];
            audioSource.PlayOneShot(clip);

            if (characterDies)
            {

                StartCoroutine(KillCharacter());                            
            }

        }

        public void Heal(float healpoints)
        {
            currentHealthPoints = Mathf.Clamp(currentHealthPoints + healpoints, 0f, maxHealthPoints);

        }

        IEnumerator KillCharacter()
        {
 
            characterMovement.Kill();
            animator.SetTrigger(DEATH_TRIGGER);
            var playerComponent = GetComponent<PlayerMovement>();
            audioSource.clip = deathSounds[UnityEngine.Random.Range(0, deathSounds.Length)];
            audioSource.Play();
            if (playerComponent && playerComponent.isActiveAndEnabled)
            {           

                print("GAME OVER");
                yield return new WaitForSecondsRealtime(audioSource.clip.length + 3f); //use audioclip
                SceneManager.LoadScene(0);
            }
            else
            {
                DestroyObject(gameObject, deathVanishSecond);
            }
            

        }
    }
}