I love it. I've advocated for years for something like this. There's a large class of users who don't want to learn to program, but whose needs are not sufficiently met by "select a variable to plot from a drop-down" type of visualisation systems, which is what I've sadly spent much of my career building.
how did you do the lines between boxes? yahoo pipes had this and I always wondered how they did it.
I think they developed their own react library for this.