well it works

Assets/Scripts/Entity.cs

@@ -17,7 +17,7 @@ public class Entity : MonoBehaviour
     public bool canMove = true;
     public bool invincible;
 
-    public void TakeDamage(float damage)
+    public virtual void TakeDamage(float damage)
     {
         health -= damage;
         if (health <= 0)

Assets/Scripts/PlayerEntity.cs

@@ -3,12 +3,15 @@ using UnityEngine;
 
 public class PlayerEntity : Entity
 {
+    [Header("Player Flags")]
     public bool hasMoved = false;
     public bool hasAttacked = false;
-    private List<TileObject> moveableTiles = new();
+    [Header("Weaponry")]
     [SerializeField] private Weapon[] weapons;
     private List<Weapon> weaponInstances = new();
     public Weapon currentWeapon;
+    [Header("UI")]
+    [SerializeField] private Transform hpBar;
     void Start()
     {
         foreach (Weapon weapon in weapons)
@@ -27,6 +30,16 @@ public class PlayerEntity : Entity
         
     }
 
+    public override void TakeDamage(float amount)
+    {
+        base.TakeDamage(amount);
+        UpdateHealthUI();
+    }
+    public void UpdateHealthUI()
+    {
+        hpBar.localScale = new Vector3(health/maxHealth, 1f, 1f);
+    }
+
     public void SkipTurn()
     {
         hasMoved = true;

Assets/Scripts/PlayerEntityMovement.cs

@@ -66,7 +66,7 @@ public class PlayerEntityMovement : MonoBehaviour
                 requestedTile = newTile;
                 foreach (TileObject tile in pathRequested)
                 {
-                    tile.sprite.color = new Color(137,137,137);
+                    tile.sprite.color = new Color(137, 137, 137, 255);
                 }
                 PathfindToTarget();
             }
@@ -98,7 +98,7 @@ public class PlayerEntityMovement : MonoBehaviour
     {
         foreach (TileObject tileObject in currentMovableTiles)
         {
-            tileObject.sprite.color = new Color(137,137,137);
+            tileObject.sprite.color = new Color32(137,137,137, 255);
         }
     }
 

Assets/Scripts/Projectile.cs

@@ -10,6 +10,13 @@ public class Projectile : MonoBehaviour
     public float speed;
     public int pierceAmount;
     private int currentPierce;
+    public float destructionTime;
+
+    private void Start()
+    {
+        Destroy(gameObject, destructionTime);
+    }
+
     private void FixedUpdate()
     {
         rb.linearVelocity = transform.right * speed;
@@ -32,4 +39,9 @@ public class Projectile : MonoBehaviour
             }
         }
     }
+
+    private void OnDestroy()
+    {
+        TurnHandler.instance.UpdateTurns();
+    }
 }

Assets/Scripts/RangedWeapon.cs

@@ -41,7 +41,6 @@ public class RangedWeapon : Weapon
                 fired = true;
                 isAiming = false;
                 thisEntity.hasAttacked = true;
-                TurnHandler.instance.UpdateTurns();
             }
             else if (Input.GetMouseButtonDown(1))
             {

Assets/Scripts/TurnHandler.cs

@@ -53,13 +53,13 @@ public class TurnHandler : MonoBehaviour
                     return;
                 }
             }
-            currentGameState = GameState.EnemyTurn;
-            if (!enemyEntities[0])
+            if (enemyEntities.Count == 0)
             {
                 EndRound();
             }
             else
             {
+                currentGameState = GameState.EnemyTurn;
                 enemyEntities[0].StartTurn();
             }
         }