Refactor save system and game manager; improve game restart functionality and state management

scripts/components/skill_unlocker_component.gd

@@ -22,7 +22,7 @@ func try_unlock_skill(skill_data: SkillData) -> bool:
 		return false
 
 	game_manager.remove_coins(skill_data.cost)
-	game_manager.current_session_state["unlocked_skills"].append(skill_data.name)
+	game_manager.current_session_state["skills_unlocked"].append(skill_data.name)
 	skill_manager.add_skill(skill_data)
 	return true
 
@@ -35,4 +35,4 @@ func unlock_all_skills() -> void:
 		skills.append(skill.name)
 
 	game_manager.unlock_skills(skills)
-	skill_manager.apply_unlocked_skills()
+	skill_manager.apply_unlocked_skills()

scripts/game_manager.gd

@@ -8,13 +8,12 @@ extends Node
 								"lives": 3,
 								"unlocked_skills": [],
 								"current_level": 0,
-								"unlocked_levels": [],
+								"unlocked_levels": [0],
 								"completed_levels": [],
 							}
 
 var nodes_in_scene := []
 
-
 var current_session_state := {
 								 "coins_collected": 0,
 								 "skills_unlocked": [],
@@ -135,6 +134,8 @@ func reset_player_state() -> void:
 		"coins": 0,
 		"lives": 3,
 		"unlocked_skills": [],
+		"current_level": 0,
+		"unlocked_levels": [0],
 		"completed_levels": [],
 	}
 
@@ -150,7 +151,6 @@ func try_to_go_to_next_level() -> void:
 		get_tree().change_scene_to_packed(level_scenes[next_level])
 
 
-
 func mark_level_complete(level_index: int) -> void:
 	unlock_level(level_index + 1)
 	if level_index not in player_state["completed_levels"]: player_state["completed_levels"].append(level_index)
@@ -163,6 +163,14 @@ func reset_current_session_state() -> void:
 	}
 
 
+
+func restart_game() -> void:
+	reset_player_state()
+	reset_current_session_state()
+	get_tree().change_scene_to_packed(level_scenes[0])
+	SaveSystem.save_game()
+
+
 func quit_game() -> void:
 	get_tree().quit()
 
@@ -177,9 +185,9 @@ func resume_game() -> void:
 
 func start_new_game() -> void:
 	reset_player_state()
-	player_state["current_level"] = 0
-	player_state["unlocked_levels"] = [0]  # Start with the first level unlocked
+	reset_current_session_state()
 	get_tree().change_scene_to_packed(level_scenes[0])
+	SaveSystem.save_game()
 
 
 func continue_game() -> void:

scripts/ui/game_over_screen.gd

@@ -22,9 +22,7 @@ func on_restart_button_pressed() -> void:
 	if not gm:
 		return
 
-	gm.reset_player_state()
-	gm.reset_current_session_state()
-	get_tree().reload_current_scene()
+	gm.restart_game()
 
 
 func on_main_menu_button_pressed() -> void: