ADD: lose screen.

src/LoseMenu/lose_menu.tscn

@@ -0,0 +1,26 @@
+[gd_scene format=3 uid="uid://ch3n607i8yqy8"]
+
+[node name="LoseMenu" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="ColorRect" type="ColorRect" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+color = Color(0, 0, 0, 1)
+
+[node name="Label" type="Label" parent="."]
+layout_mode = 0
+offset_left = 473.0
+offset_top = 54.0
+offset_right = 551.0
+offset_bottom = 77.0
+text = "YOU LOSE"

src/MainMenu/main_menu.tscn

@@ -0,0 +1,18 @@
+[gd_scene format=3 uid="uid://sj7j3yxfjkko"]
+
+[node name="MainMenu" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="Button" type="Button" parent="."]
+layout_mode = 0
+offset_left = 518.0
+offset_top = 184.0
+offset_right = 565.0
+offset_bottom = 215.0
+text = "PLAY
+"

src/Sandbox/sandbox.gd

@@ -2,18 +2,26 @@ extends Node2D
 
 var m_broken_timer = 0.0
 var m_broken_time = 0.2
+var process_state = null
+var m_death_timer = 0.0
+var m_death_time = 1.0
 
 func _ready():
 	for bear in get_tree().get_nodes_in_group('bears'):
 		bear.m_target = $Player
 		bear.m_world = self
 	$Player.m_world = self
+	self.process_state = self.process
 	
 func _process(delta):
+	if self.process_state:
+		self.process_state.call(delta)
+	
+func process(delta):
 	for actor in get_tree().get_nodes_in_group('actors'):
 		if is_outside(actor) and actor.is_normal():
 			actor.to_falling()
-	
+
 	if m_broken_timer >= m_broken_time:
 		var k = 0
 		var N = 2
@@ -31,6 +39,18 @@ func _process(delta):
 	
 	m_broken_timer += delta
 	
+	if $Player/Actor.is_dead():
+		self.process_state = self.process_death
+		m_death_timer = 0.0
+		
+func process_death(delta):
+	var f = m_death_timer/m_death_time
+	$CanvasLayer/ColorRect.modulate = Color(0, 0, 0, f)
+	if m_death_timer >= m_death_time:
+		get_tree().change_scene_to_file("res://LoseMenu/lose_menu.tscn")
+		
+	m_death_timer += delta
+	
 func is_outside(actor):
 	var coord = $TileMap.local_to_map(actor.global_position)
 	var tile : TileData = $TileMap.get_cell_tile_data(0, coord)