First of all, brilliant tool. Even in the early stage it looks clean and provided great output. Some suggestions on what to add:
- An offline guide, preferably included with the tool: It took me a while to find the tutorial on how to use it, and I was confused with what to do. I assumed there was a PDF or textfile with basic instructions but there weren't any. Not even the tool itself provided much in the help button.
- Ability to navigate around the board: Some of the presents go slightly offscreen, so it doesn't help that there isn't a way for me to drag the entire node board to that area. Maybe click-n-drag on the grid so you can move the whole grid around?
- Clearer Export Options: I personally don't like clicking the texture itself to export it, especially since placing your mouse over it doesn't show a message in the top-left to say "Export Texture" (although not everything you mouse-over has a message so I can assume that it's gonna be added later?). What I'd prefer is a button in the same place as saving and loading a file to export a texture, with a menu that provides options like which texture, what file format ect...
- AutoTiling Export? Just to suggest an actual feature, maybe allow some basic autotiling export functionality.
Those are some of my suggestions, apologies if any of these have already been mentioned.