test/Assets/scrpts/hp.cs

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

public class hp : MonoBehaviour
{
    
    [HideInInspector] public float PlayerHP;
    [Header("Полоска здоровья")]
    public Image HPImage;
    
    void Start()
    {
        PlayerHP = 100;
    }

    // Update is called once per frame
    void Update()
    {
        HPImage.fillAmount = PlayerHP/100;
        if(PlayerHP<=0 && this.gameObject.tag=="Player")
        {
            SceneManager.LoadScene(0); 
        }

        if (PlayerHP <= 0 && this.gameObject.tag == "Enemy")
        {
            Destroy(this.gameObject);
        }
    }

    public void SetDamage(float damage)
    {
        PlayerHP -= damage;
    }

    public void SetHealth(float health)
    {
        PlayerHP += health;
    }
}