Enhance game over scene: implement GameOver class with options for retry and main menu, add background image, and handle mouse and keyboard interactions.

game/weapons/lorentz_field.rb

@@ -1,16 +1,17 @@
 class LorentzField
   BASE_TIME = 25 # Base time for the field to be active in seconds
 
-  def initialize
+  def initialize(bus)
+    @bus = bus
     @time = 0
     @active = false
     @font = Gosu::Font.new(24, name: "assets/fonts/tn.ttf")
 
-    $bus.on(:lorentz_field?) do
+    @bus.on(:lorentz_field?) do
       next @active
     end
 
-    $bus.on(:lorentz_field) do
+    @bus.on(:lorentz_field) do
       if @active
         t = @time
         remaining = BASE_TIME - t
@@ -33,10 +34,10 @@ class LorentzField
 
   def attack(_direction)
     return if @active
-    $bus.emit(:consume, :lorentz_field, 1)
+    @bus.emit(:consume, :lorentz_field, 1)
     @active = true
     @time = 0
-    $bus.emit(:lorentz_field!, true)
+    @bus.emit(:lorentz_field!, true)
   end
 
   def update(dt)
@@ -46,7 +47,7 @@ class LorentzField
     if @time >= BASE_TIME
       @time = 0
       @active = false
-      $bus.emit(:lorentz_field!, false)
+      @bus.emit(:lorentz_field!, false)
     end
   end