Then maybe something more generic sounding like ClojEngine? Naming is hard lol. Core is fine, but maybe add one more word to it, because googling just "Core" to find your repo is difficult.

But I highly recommend changing the capitalization of Maker to maker to avoid being mixed up with the product RPG Maker. Adding "an" helps signal that it's a descriptor instead of a name too.

Core: An RPG maker and engine for Clojure.