Unity - Basic script to manage player health

PlayerHealthManager.cs

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

public class PlayerHealthManager : MonoBehaviour
{
    public int startingHealth;
    private int currentHealth;
    public float flashLength;
    private float flashCounter;
    private Renderer renderColor;
    private Color storedColor;

    void Start()
    {
        currentHealth = startingHealth;

        // Get colours from gameObject
        renderColor = GetComponent<Renderer>();
        storedColor = renderColor.material.GetColor("_Color");
    }

    void Update()
    {
        // Kill player if health runs out
        if (currentHealth <= 0)
        {
            gameObject.SetActive(false);
        }

        // Change colour back to original after certain time
        if (flashCounter > 0)
        {
            flashCounter -= Time.deltaTime;
            if (flashCounter <= 0)
            {
                renderColor.material.SetColor("_Color", storedColor);
            }
        }
    }

    // Apply player damage
    public void DamagePlayer(int damage)
    {
        currentHealth -= damage; // Apply damage
        flashCounter = flashLength; // Set time for color change
        renderColor.material.SetColor("_Color", Color.red); // Change color
    }
}