added Enemy

Assets/Scripts/Character.cs

@@ -29,12 +29,11 @@ public class Character : MonoBehaviour
     {
         var groundCheck = Physics2D.BoxCast(_boxCollider.bounds.center, _boxCollider.bounds.size, 0f, Vector2.down, .1f, groundLayer);
 
-        float h_movement=0;
         float v_movement=0;
         if (groundCheck || _isOnLadder)
         {
             _isFall = false;
-            h_movement=inputHorizontal ;
+            float h_movement = inputHorizontal;
             if (h_movement > 0 && !_facingRight)
             {
                 FlipCharacter();

Assets/Scripts/EnemyAI.cs

@@ -1,7 +1,22 @@
-using System.Collections;
-using System.Collections.Generic;
 using UnityEngine;
+using static UnityEditor.Searcher.SearcherWindow.Alignment;
 
 public class EnemyAI :Character
 {
+
+
+    private void Update()
+    {
+        float horizontal = 0;
+        float vertical = 0;
+        if (Mathf.Abs(Player.Instance.transform.position.x - transform.position.x)>0.5f)
+        {
+            horizontal = Player.Instance.transform.position.x - transform.position.x;
+        }
+        else
+        {
+            vertical = Player.Instance.transform.position.y - transform.position.y;
+        }
+        base.MoveTo(horizontal, vertical);
+    }
 }

Assets/Scripts/Player.cs

@@ -2,10 +2,24 @@ using UnityEngine;
 
 public class Player : Character
 {
-    
-
     private int _totalCoins = 0;
     private bool _hasKey = false;
+    public static Player Instance { get; private set; }
+
+    private void Awake()
+    {
+
+        if (Instance != null)
+        {
+            Destroy(gameObject);
+            Debug.Log("There's more than one player instance");
+            return;
+        }
+        PlayerPrefs.SetString("lastExitName", string.Empty);
+        Instance = this;
+        DontDestroyOnLoad(gameObject);
+    }
+
 
     public void AddCoin()
     {