Combat Mode is more reliable now, just one little glitch that it doesn't exit on the last enemy dying.

systems.cpp

@@ -215,6 +215,8 @@ void System::collision(GameLevel &level) {
         println("UNKNOWN COLLISION TYPE {}", entity);
       }
     }
+  } else {
+    world.send<Events::GUI>(Events::GUI::NO_NEIGHBORS, player.entity, player.entity);
   }
 }