PlayerHealth.cs

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

public class PlayerHealth : MonoBehaviour
{
    public int health = 30;

    public GameObject deathEffect;

    public int damage = 1;

    public Text healthtext;

    public GameObject hitEffect;

    public string gameOver = "GameOver";


    void Start()
    {
        health = 30; //sets player health
        Sethealthtext();
    }

    void Sethealthtext()
    {
        healthtext.text = "HEALTH: " + health.ToString(); //allows the text to display how much health you have
    }

    public void TakeDamage(int damage)//Damages player on collision with enemy bullet
    {
        health -= damage;
        healthtext.text = "HEALTH: " + health.ToString();
        Instantiate(hitEffect, transform.position, Quaternion.identity); //allows the player to take a certain amount of damage when hit, and spawns an effect as a result

        if (health <= 0) //checks if health is 0
        {
            Die();
            StartCoroutine(OnDead());
        }
    }

    void Die() //destroys enemy when health is 0 and spawns an explosion
    {
        Instantiate(deathEffect, transform.position, Quaternion.identity); //spawns explosion
        gameObject.GetComponent<SpriteRenderer>().enabled = false;
        //destroys player when health is at 0
        //starts the ondead coroutine
    }

    IEnumerator OnDead()
    {
        yield return new WaitForSeconds(3f); //makes the scene wait for 3 seconds
        SceneManager.LoadScene(gameOver); //goes to the game over scene

    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.gameObject.CompareTag("Heart")) //checks if the tag of the object is rocket
        {
            if (health < 99)
            {
                other.gameObject.SetActive(false); //makes object disappear when player collides with object
                health = health + 5;
                Sethealthtext(); //sets the object to false on collision and gives the player a powerup (rocket) and displays it on the text
                GetComponent<AudioSource>().Play();
            }
        }
    }


}