Added code example

Author: alexandrawaas

Code Example/HealthController.cs

@@ -0,0 +1,81 @@
+using UnityEngine;
+using UnityEngine.AI;
+
+public class HealthController : MonoBehaviour
+{
+    private static HealthController _instance;
+    [SerializeField] public int maxHealth = 100;
+    public int CurrentHealth { get; private set; }
+    [SerializeField] private HealthUI healthUI;
+    [SerializeField] private GameObject haensel;
+    [SerializeField] private GameObject gretel;
+    [SerializeField] private Transform haenselSpawnPoint;
+    [SerializeField] private Transform gretelSpawnPoint;
+    private GameObject _passivePlayer;
+    private GameOverUIController _gameOverUI;
+
+
+
+    public static HealthController Instance
+    {
+        get {
+            if (_instance == null) {
+                Debug.LogError("Health Controller not instantiated.");
+            }
+            return _instance;
+        }
+    }
+
+    private void Start()
+    {
+        _instance = this;
+        CurrentHealth = maxHealth;
+        _gameOverUI = GameObject.FindGameObjectWithTag("Canvas").GetComponent<GameOverUIController>();
+    }
+    private void Awake()
+    {
+        _instance = this;
+    }
+
+    private void Update()
+    {
+        // calculate index of health sprite image: 10 images from 0-9 in reversed sequence 
+        healthUI.ChangeHealth(9 - (CurrentHealth / (maxHealth / 10)));
+    }
+
+    public void TakeDamage(int damage, GameObject player)
+    {
+        if (CurrentHealth-damage <= 0) 
+        {
+            OnDeath(player);
+            return;
+        }
+        CurrentHealth -= damage;
+        player.GetComponent<HealthFlashController>().FlashRed();
+        healthUI.Flash();
+    }
+
+    public void Heal(int amount)
+    {
+        if (CurrentHealth + amount <= maxHealth)
+        {
+            CurrentHealth += amount;
+        }
+        else
+        {
+            CurrentHealth = maxHealth;
+        }
+    }
+
+    public void OnDeath(GameObject player)
+    {
+        Debug.Log("Game Over");
+        _gameOverUI.ToggleGameOverUI();
+        _passivePlayer = haensel.CompareTag(player.tag) ? gretel : haensel;
+        _passivePlayer.GetComponent<NavMeshAgent>().enabled = false;
+        haensel.transform.position = haenselSpawnPoint.position;
+        gretel.transform.position = gretelSpawnPoint.position;
+        _passivePlayer.GetComponent<NavMeshAgent>().enabled = true;
+        CurrentHealth = maxHealth;
+    }
+}