A very, versy simple way to save and load games in Godot Engine

save_load.gd

extends Node

func save_game():
	var scene = PackedScene.new()
  
	scene.pack(self)
	ResourceSaver.save("user://save_01.tscn", scene)
	
func load_game():
	var scene = load("user://save_01.tscn")
	get_tree().change_scene_to(scene)

This is meant to be attached to the top-most Node of a scene, i.e. the root.

Ohh, by the way. If your player node isn't part of the PackedScene this node is in, i.e. if you didn't added it in this node's hierarchy through the Editor, making it part of the .tscn file corresponding to this scene, you have to manually set this node as the owner of the player before line 6.

Something like:

    get_node("path_to_player").owner = self

Enjoy! 🎉

You don't want to put this on every node. Instead, you can turn it into a reusable node that you put around the root of your main game scene:

func save(branch, save_id):
    var scene = PackedScene.new()
    scene.pack(branch)
    ResourceSaver.save("user://save_%s.tscn" % save_id, scene)
	
func load(id):
    var scene = load("user://save_%s.tscn" % id)
    # change scene or return the loaded scene