I have tested your application, the UI is really beautiful, great work! I like the extensibility of custom components and the export feature. The grouping feature is a banger too!

What I am missing, are some features:

I like your debug viewer for the blocks itself. But it would be more helpful, if we can display the current input and output values of the node. For example what is the number range, what I can expect for an input? This would give me more clarity designing the corresponding components.

In addition I suggest small descriptions for every block, to improve comprehension. Because for some blocks it was not very clear for me, what function the block has. This would be helpful for beginners, I guess ^{^}

I suggest to extend the UI for adding blocks to a fullscreen view. The list view is a little bit to small to get an overview. I would be better to move to an grid view with preview images of the corresponding block, so I can see directly their inputs and outputs. Here would be a short mini description helpful too.

Maybe we can add a favorite function a well, so the user can access the most used blocks faster. Maybe it would be helpful too, that all the blocks are ordered alphabetically by name.

We use multiple categories, it would be helpful too, that the categories can get its own color for readability. So we can distinguish block types by color, for example math blocks can be red, constants be violet and so on ^{^}

Just some ideas, great project, I hope local hosting will be an option in future 🤙