I previously looked at stuff like https://flowhub.io/ide/ which is a dataflow language spec and editor. Specifically the js version https://noflojs.org/example/ for compiling graphs into js for some canvas image pipeline work.
Each component has an underlying text representation that you can edit like you guys. But that representation isn't code. It's just the configuration of the node.
This isn't what I want! I want to architect the dataflow on a whiteboard, code it normally (a new language is okay), and then have it visualize the same dataflow for debugging (with help grouping/organizing if needed). Every programmer already does this in their head but without the visual aid.
(Focusing too much on the graphical representation is a mistake. There's only a handful of granularities that are worth whiteboard diagramming and people definitely don't want to code with a mouse dragging and zooming. But having the diagram at specific architectural level when you do need it is invaluable)
I haven't tried your product out yet so I don't know if you guys got it right, but at the very least you guys recognize the importance of "dual syntax representation" as a selling point!