diff --git a/Ghost.Entities.Test/ArcEntityTest.cs b/Ghost.Entities.Test/ArcEntityTest.cs
index 6107043..eb847b3 100644
--- a/Ghost.Entities.Test/ArcEntityTest.cs
+++ b/Ghost.Entities.Test/ArcEntityTest.cs
@@ -2,7 +2,6 @@ using Ghost.Test.Core;
 using Misaki.HighPerformance.Jobs;
 using Misaki.HighPerformance.LowLevel.Buffer;
 using Misaki.HighPerformance.Mathematics;
-using System;
 
 namespace Ghost.Entities.Test;
 
diff --git a/Ghost.Entities/EntityManager.cs b/Ghost.Entities/EntityManager.cs
index 26f4d9f..af68cda 100644
--- a/Ghost.Entities/EntityManager.cs
+++ b/Ghost.Entities/EntityManager.cs
@@ -2,7 +2,6 @@ using Ghost.Core;
 using Misaki.HighPerformance.LowLevel.Buffer;
 using Misaki.HighPerformance.LowLevel.Collections;
 using Misaki.HighPerformance.LowLevel.Utilities;
-using System;
 using System.Diagnostics;
 
 namespace Ghost.Entities;
diff --git a/Ghost.Entities/World.cs b/Ghost.Entities/World.cs
index 36bf077..2f1c19b 100644
--- a/Ghost.Entities/World.cs
+++ b/Ghost.Entities/World.cs
@@ -2,16 +2,15 @@ using Ghost.Core;
 using Misaki.HighPerformance.LowLevel.Buffer;
 using Misaki.HighPerformance.LowLevel.Collections;
 using System.Runtime.CompilerServices;
-using TerraFX.Interop.Windows;
 
 namespace Ghost.Entities;
 
 public partial class World
 {
-    private static List<World?> s_worlds = new(4);
-    private static Queue<Identifier<World>> s_freeWorldSlots = new();
+    private static readonly List<World?> s_worlds = new(4);
+    private static readonly Queue<Identifier<World>> s_freeWorldSlots = new();
 
-    internal static Identifier<Archetype> EmptyArchetypeID => new Identifier<Archetype>(0);
+    internal static Identifier<Archetype> EmptyArchetypeID => new (0);
 
     public static int WorldCount => s_worlds.Count - s_freeWorldSlots.Count;
 
@@ -43,10 +42,7 @@ public partial class World
             }
 
             var world = s_worlds[id.value];
-            if (world is not null)
-            {
-                world.Dispose();
-            }
+            world?.Dispose();
         }
     }
 
@@ -72,8 +68,8 @@ public partial class World : IIdentifierType, IDisposable, IEquatable<World>
 {
     private readonly Identifier<World> _id;
 
-    private EntityManager _entityManager;
-    private EntityCommandBuffer _entityCommandBuffer;
+    private readonly EntityManager _entityManager;
+    private readonly EntityCommandBuffer _entityCommandBuffer;
 
     private UnsafeList<Archetype> _archetypes;
     private UnsafeList<EntityQuery> _entityQueries;
diff --git a/omnisharp.json b/omnisharp.json
new file mode 100644
index 0000000..b052e3d
--- /dev/null
+++ b/omnisharp.json
@@ -0,0 +1,6 @@
+{
+    "Logging":
+    {
+        "LogLevel": "Error"
+    }
+}