Some tweaks

game/game.gd

@@ -2,12 +2,9 @@ extends Node
 
 signal show_main_menu
 
-
 var _pause_menu: PauseMenu
 var _current_passage: Passage
 
-var _show_pause_menu: bool = false
-
 
 func _ready() -> void:
     _current_passage = load("res://game/passage.tscn").instantiate()
@@ -15,33 +12,30 @@ func _ready() -> void:
     
     
 func _input(event: InputEvent) -> void:
-    if event.is_action_pressed("pause") and not _current_passage.is_paused():
+    if event.is_action_pressed("pause") and not get_tree().paused:
         _pause_game()
 
 
-func _process(_delta: float) -> void:
-    if _show_pause_menu:
-        _pause_menu = load("res://menu/pause_menu.tscn").instantiate()
-        add_child(_pause_menu)
-        _pause_menu.continue_game.connect(_unpause_game)
-        _pause_menu.show_main_menu.connect(_show_main_menu)
-        _show_pause_menu = false
+func _create_pause_menu() -> void:
+    _pause_menu = load("res://menu/pause_menu.tscn").instantiate()
+    add_child(_pause_menu)
+    _pause_menu.continue_game.connect(_unpause_game)
+    _pause_menu.show_main_menu.connect(_show_main_menu)
 
 
 func _pause_game() -> void:
-    _current_passage.set_paused(true)
+    get_tree().paused = true
     _current_passage.visible = false
-        
-    _show_pause_menu = true
+    _create_pause_menu.call_deferred()
     
 
-
 func _unpause_game() -> void:
-    _current_passage.set_paused(false)
+    get_tree().paused = false
     _current_passage.visible = true
-        
+    
     _pause_menu.queue_free()
     
 
 func _show_main_menu() -> void:
+    get_tree().paused = false
     show_main_menu.emit()