I wonder how hard it would be to use this with Unity? Getting a REPL into a running game is the biggest reason I'm interested in Lisp in games, but engine options are limited (the one I've tried is LOVE with Fennel, but Fennel is a bit odd as a Lisp and doesn't actually give you a REPL into a live program without extra work, and LOVE gives a lot less engine-stuff than Unity).
http://arcadia-unity.github.io/
Re: #Script Lisp
#11Seconding this. Arcadia is a breeze to get running.