Added level selection screen

game/managers/save_manager.gd

@@ -0,0 +1,40 @@
+class_name CSaveManager
+extends Node
+
+
+@export var save_file_path := "user://save.bin"
+@export var save_file_pass := "save_file_data"
+
+
+const CATEGORY_GAME = "game"
+const GAME_COMPLETED_LEVELS = "completed_levels"
+
+
+var completed_levels := 0
+
+var _save_file: ConfigFile
+
+
+func _ready() -> void:
+	_save_file = ConfigFile.new()
+	_load()
+
+
+func save() -> void:
+	_save_file.set_value(CATEGORY_GAME, GAME_COMPLETED_LEVELS, completed_levels)
+	_save_file.save_encrypted_pass(save_file_path, save_file_pass)
+
+
+
+
+func _load() -> void:
+	if _save_file.load_encrypted_pass(save_file_path, save_file_pass) == OK:
+		_process_save_file()
+	
+	save()
+
+
+func _process_save_file() -> void:
+	completed_levels = _save_file.get_value(
+		CATEGORY_GAME, GAME_COMPLETED_LEVELS, completed_levels
+	)