This simply backs up and restores the necessary save files from the game's folder on your device. It doesn't do anything else.

This game has perma-death, but isn't competitive, so this can be used to create savepoints. However, the game is not meant to be experienced with savepoints. Just saying.

Make sure you read the readme file, but I will also write everything underneath.

Github Repository[github.com]

Installing Python and dependancies:

Download Python from Python's official website
During installation, check "Add Python to PATH"
Verify installation by opening Command Prompt (Windows) or Terminal (Mac/Linux) and running:

python --version

Then, install the dependancy:

pip install tkinter

Then navigate to the folder where saveUI.py is, and run

python saveUI.py

(for Windows) or

python3 saveUI.py

(for Linux/MacOS)

Source Path (the game's path that contains its own saves):

Click on the "browse" button of "Source Path", then navigate to where the game's savegames are (the general folder, where SaveData.json is located), then click on "save" next to it. This path should be something like: C:\Users<Your_Username>\AppData\LocalLow\WinterSpring Games\Card Survival - Tropical Island

Destination Path (the folder that will hold your own savegames):

Click on the "browse" button of "Destination Path" and select the path where the saved games will exist (preferably the folder where this file is also in).

Save Game:

First, quit the current session by selecting "save and quit". After that, you can simply click on the "Save Game" tab, select a slot and a save name, and there. It will save it for you (it copies the files basically).

Load Game:

Quit the game first completely, then click on "Load Game" tab on the UI, and select a slot.

It works for me!