A programming language is called a language for a reason - it should activate the human linguistic lobes.
Another programmer said this, a long time ago, and that's how we ended up with Perl. Please don't seek to emulate Larry Wall. Perl is great for quick automation, but anything complicated built with Perl quickly converges to unintelligible line noise (barring the exercise of zen-like discipline). If you're making something for beginners, please, please, give them the tools to build abstractions in a consistent and understandable manner.
But that said, the main difference between Hoon line noise and Perl line noise is that most of the ASCII we use has a very regular structure, with a (relatively) limited set of exceptions. So it looks about equally alien at first, but the Hoon ideogram (digraph) set should be easier to learn. Unfortunately at present the set of people who know it is very small - so the theory really hasn't been tested.
It is what it is. But at least there's no Unicode. (Not that you can't have Unicode in strings, of course.)
And anyone who doesn't like line noise has to stand up for reserved words. Some of us welcome that conversation...
What about unicode in comments? If I put a string in a comment can it go there?
If you put unicode in variables, perhaps because you're using a national keyboard with special unicode powers, your code will be extremely hard to work with for programmers using a different national keyboard. Thus, even if you could do it, you shouldn't.
Now, the symbols on American programmers' keyboards are not all on every keyboard in the world - but pretty much every programmer in the world knows how to find them. Thus, sticking with ASCII is basically sensible use of Postel's Law in the language design context.
In comments - it should be ok but I think it breaks right now. Not a high priority bug, but definitely a bug.
And besides, I can't Google for "go." And yet, Go seems to be doing just fine...
One day you will be repeating these words, to a youngster that says the heroes of your Ruby palace, (or your conquering Pythonistas) were weak men of little vision, and laughs at you for following them. And when that day comes, I ask only that you think of me, and Wall, as I now think of one who followed Backus, and the mighty FORTRAN army.