Change sprite of guards while strafing around them

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/features/difficulty/difficulty_screen.dart

@@ -9,6 +9,21 @@ class DifficultyScreen extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       backgroundColor: Colors.black,
+      floatingActionButton: FloatingActionButton(
+        backgroundColor: Colors.red[900],
+        onPressed: () {
+          Navigator.of(context).push(
+            MaterialPageRoute(
+              builder: (_) => const WolfRenderer(
+                difficulty: Difficulty.bringEmOn,
+                // isDemo: true,
+                showSpriteGallery: true,
+              ),
+            ),
+          );
+        },
+        child: const Icon(Icons.bug_report, color: Colors.white),
+      ),
       body: Center(
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,