Mine is nearly pure Interlisp with only 1 Common Lisp call for BUTLAST. Interlisp is *much* older than Common Lisp (going back to the 1960s) and a very different language. But they both can be used together in Medley which runs Interlisp and Common Lisp (CLTL1 + some CLTL2). Please add Interlisp-D (Interlisp) since it helps the Medley Interlisp Revival project. :)
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Interlisp is very different from Common Lisp; back before the standardization process happened, Interlisp and MacLisp were the two main competing branches of lisp. During standardization the MacLisp people won and Interlisp has been mostly forgotten. (until one game jam contestant decided it was time it made a comeback!)
This HOPL paper on early lisp history is pretty fascinating; I learned a ton: https://doc.lagout.org/programmation/Lisp/Lisp%20Mess/Gabriel%20%26%20Steele%20-%20The%20Evolution%20of%20Lisp.pdf
I think it is correct to say interlisp medley as the language (and not refer to it as interlisp-d because it is quite different to the 80s d machines - I’m pretty sure I have seen the Medley crew give this correction before). Of course, interlisp is a complete programming system which includes its common lisp implementation.
Pixel Outlaw, I am so happy with your game and your promulgation of the incredible work by interlisp.org.