The Joy programming language

A few weeks ago I was asking about stack based languages in #scheme. I would like to learn more about them and I was looking for a good language with which to start.
Joy was pointed out as a great place to start, and in particular this tutorial is the best place to start with Joy.
From what the Joyer in #scheme shared and from what I have read, Joy seems to be a very interesting language as it is very Lisp like in its simplicity and extensibility.