var save_pass = "your_save_password"
func save_level_stars(level_index, num_stars):
	#save only if the current number of stars is greater than the saved one
	if save_data[level_index] >= num_stars:
		return

	save_data[level_index] = num_stars
	var f = File.new()
	var err = f.open_encrypted_with_pass("user://"+ current_package_id +".bin", File.WRITE, save_pass)
	f.store_var(save_data)
	f.close()