fix build errors

Assets/Engine/Runtime/Editor/EngineEditor.cs

@@ -4,6 +4,7 @@ using UnityEngine.UIElements;
 
 namespace EscapeRoomEngine.Engine.Runtime.Editor
 {
+    #if UNITY_EDITOR
     public class EngineEditor : EditorWindow
     {
         private bool _registeredUpdateEvent;
@@ -86,4 +87,5 @@ namespace EscapeRoomEngine.Engine.Runtime.Editor
             _skipAndPassButton.SetEnabled(EditorApplication.isPlaying && Engine.DefaultEngine.NumberOfRooms > 0);
         }
     }
+    #endif
 }

Assets/Engine/Runtime/Engine.cs

@@ -36,7 +36,7 @@ namespace EscapeRoomEngine.Engine.Runtime
         public IOption<Room> CurrentRoom => NumberOfRooms > 0 ? Some<Room>.Of(_rooms[^1]) : None<Room>.New();
 
         private readonly List<Room> _rooms = new();
-        private GameObject _playSpaceOrigin, _environment;
+        private GameObject _playSpaceOrigin;
 
         private void Start()
         {
@@ -44,11 +44,6 @@ namespace EscapeRoomEngine.Engine.Runtime
             _playSpaceOrigin.transform.SetParent(transform);
             _playSpaceOrigin.transform.localPosition = new Vector3(-theme.playSpace.x / 2f, 0, -theme.playSpace.y / 2f);
 
-            if (theme.environment)
-            {
-                _environment = Instantiate(theme.environment, _playSpaceOrigin.transform, false);
-            }
-
             GenerateRoom();
         }
 
@@ -62,11 +57,16 @@ namespace EscapeRoomEngine.Engine.Runtime
             var room = new Room(entrance);
             _rooms.Add(room);
             
-            GenerateSpace(room, entrance); // TODO: rooms with more than one space
+            GenerateSpace(room, entrance);
 
             var roomId = _rooms.Count - 1;
             room.InstantiateRoom(_playSpaceOrigin.transform, roomId * roomOffset, roomId.ToString());
 
+            if (theme.environment)
+            {
+                Instantiate(theme.environment, room.roomObject.transform, false);
+            }
+
             UpdateUI();
         }