I added some further instructions on how to compile and run the game in a comment on the game's page https://dirtdog.itch.io/wizards-keep (I uploaded the dependencies to the Codeberg repo and slightly updated the init.lisp script to also load those dependencies, as such this is to be considered as done "after the deadline"). The most up to date version can be retrieved from the Codeberg repo: https://codeberg.org/dirtdog/wizkeep