switch back to Sneak as the default game

Shared/SneakGame.cs

@@ -64,11 +64,11 @@ namespace SemiColinGames {
 
     private void LoadLevel() {
       world?.Dispose();
-      // world = new SneakWorld(GraphicsDevice, Content.LoadString("levels/demo.json"));
-      world = new TreeWorld();
+      world = new SneakWorld(GraphicsDevice, Content.LoadString("levels/demo.json"));
+      // world = new TreeWorld();
       scene?.Dispose();
-      // scene = new SneakScene(GraphicsDevice, ((SneakWorld) world).Camera);
-      scene = new TreeScene(GraphicsDevice);
+      scene = new SneakScene(GraphicsDevice, ((SneakWorld) world).Camera);
+      // scene = new TreeScene(GraphicsDevice);
 
       GC.Collect();
       GC.WaitForPendingFinalizers();