This reminds me of befunge[1], which is also a two dimensional programming language, and has been around for quite a while. This language looks a bit simpler and easier to understand, though. Neat.
"[I]n Befunge, there is no comment syntax: to embed documentation in the code, the programmer simply routes the control flow around the 'comment' area, so that the text in that area is never executed"
I'd argue that Befunge is far simpler. It's yet-another-esoteric-programming-language but the program pointer can move in 4 directions instead of 2. Every instruction is simple stack/heap manipulation or IO. AsciiDots looks a lot more complicated, multiple program pointers which are also the variables in the program with no concept of stack or heap. Not to mention library support, too.
[1]: https://en.wikipedia.org/wiki/Befunge
"[I]n Befunge, there is no comment syntax: to embed documentation in the code, the programmer simply routes the control flow around the 'comment' area, so that the text in that area is never executed"