Not made much of a head way with doing my functional game but got a nice setup with clojure to do live coding.
You get the program running, edit some code and then just hit C-c C-c with the cursor over the function you want to be recompiled. And it all works :D Amazing stuff really and really good fun. You can also muck about in the repl. Quite enjoying this.
It's all about 60hz too, the recording is a bit slower as I'm using Quicktime's screen record and this is a Retina machine.
The only downside is it's meant having to learn EMACS but actually that's turned out pretty nice. Learning curve like a cliff but horrendously powerful. I'll have another crack at this on the w/e