Show HN: MsgViz, an animated message passing diagram editor

I am primarily a backend developer, so this is a small foray into the javascript/front end world. This is a small side project I put together to learn Vue / D3.js. The concept is to let users create animated message passing diagrams. I suspect there may be other tools that do this, but I wasn't able to find anything that worked in a similar way.

The front page illustrates some examples I made, though if someone can come up with some better ones, I'd be happy to add them with attribution! There is a simple back end that allows diagrams to be saved. You can edit it with one link, and share it in read only mode with another.

The tool itself is very much a POC, but most of the basic functionality is there. There are some issues with layout, and load times/performance. In addition, the site does not work well on mobile, though it would be quite difficult to do so I expect. Any feedback would be appreciated however!