Just a question. I wrote my own lisp dialect that produce 6510 code. Can I take part to the jam?
@mfiano will have the final ruling, but I think as long as Lisp is your primary language, you should be fine -- "Must be written in any dialect of Lisp."
Keep in mind that most of the people judging may not have a C64 available to test, so you should provide an easy emulation route for them if possible...
If the source code for the game is in this Lisp-like language you've made and you provide the compiler (preferably as source code) then it should be fine. If Fennel (one of the least Lispy Lisp-like languages I've seen) is okay, then this should be too.
For binary distribution I would recommend supplying a cartridge ROM image if possible, since that appears to be the easiest to run in the VICE emulator. Disk images seem to be pretty easy to load too, but you should provide instructions in either case since the process is not completely obvious.
How cool! Lisp should be everywhere!
In case your interested, there are others combining lisp and c64 retro game development :
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Written by Ross McKinlay
The Racket based cross-platform 6502 assembler. Primarily aimed at programming the Commodore 64, with VICE emulator support.
We had an entry last time using a custom lisp stack which targeted the Apple ][gs so I mean, seems right up the same alley: https://spindleyq.itch.io/8-bitsy