Yeah I love it too! I just wish I wasn't about ~4yrs late to the party! Oh well better late then never! My goal(s) right now are to help revitalise the twtxt community and build software and tool that help make it easier for _anyone_ to use. So far that's
https://feeds.twtxt.net and
https://twtxt.netYes (_just realised I used them here_); the lack of "multiple lines" does feel a bit limiting sometimes; but its not that bad really once you get used to it. I implemented twtxt,net's software such that you couldn't actually accidentally the format of the underlying twtxt.txt files that it writes to.
OTOH I did add Makrdown rendering support to the client (web) that is twtxt.net so you at least have a nice subset of Markdown formatting including pictures!