I have uploaded a new tool with which you can build your own image packages (swap files) for my game Swap’em!.
The tool comes with a manual which contains a detailed description of how to build a new swap file. You just need to prepare the images, follow the steps and you can play using your own images in no time.
One of the limitations of the tool is that it cannot resize nor crop the images so you need to prepare 16 images each with a resolution of 3840x2160 pixels.
The other limitation is that it cannot edit existing swap files.
You can download it from my website: https://www.nightloversgamestudio.net
screenshot:

Have fun with it!
neuronic

