I have been following this project closely for a while as it is simular to an imaginary language I've always wanted (and have been slowly working on myself). Whereas Kitten comes from a Haskell heritage (thus functionally pure), mine comes from a Forth hertiage (it is a true Forth). Kitten, as it seems to me, is a potentially awesome hybrid of Haskell, C (more under the hood) and Forth and I am very much looking forward to seeing its fruition. It's about time concatinative languages got their modern, mainstream turn in the sun.
I like that concatenation works with space instead of more verbose operators like for example Elixir's |><p>It basically turns space into the dot of most object oriented languages. It would be ok to use a dot too, but the space looks better and leaves the option of using the dot inside function names. I wish they could change the syntax of Elixir to look like that.<p>I probably missed it, but how do we import functions from another file / module? And how about multi-line concatenations?