quite well... the basic ideas have been brewing for ages (over two years in fact), but I finally made some progress on the design over the past month and started work on an interpreter. I got quite far this weekend and I think all that's missing is deciding on and implementing all the built-ins (which sounds like a lot of work, but the hard part was getting the overall language semantics down)
I should really be implementing this in Haskell, but I don't know enough Haskell to get the interpreter done in a reasonable amount of time, so I ended up implementing a functional language in Ruby... well...
it's definitely my most ambitious esolang yet in terms of design. (Alice has more built-ins, but that's not a great measure for language complexity.)
oh and I'm not counting Retina, because it's kinda straddling the boundary between esolang and practical language at this point.