Hey this is Marc, I just posted your example flowgraph to the site, after adding some Time Sinks to visualize the sound. Should be under the Audio category of example flowgraphs. Really glad you played around with it!!
Hey it's Marc, creator of GNU Radio World, I'm glad you brought this up, I made it thinking it would be used by folks already familiar with GNU Radio, but this site can double as a way to introduce new people to GNU Radio, so it might as well have a more friendly introduction that walks you through the basics. I'll start working on it!
I'm glad people like it!!! I'll keep working on improving the site and adding support for more SDRs and OOTs. My initial motivation for creating GNU Radio World was to have a way to embed interactive examples into PySDR.org, which I have started to do, eg see https://pysdr.org/content/sync#frame-synchronization. I think GNU Radio World has a lot of potential directions it could go, and if anyone is interested in helping out with it feel free to join the Discord server or email me.