Checking out this during 7DRL of this year for ideas, like others mentioned it has an issue with double movement, which fires less often on the diagonals. Beyond that a solid game.
it seems to be an issue with the underlying "JSRL" infrastructure code so likely shared with Emerald Woods as well.. ? LIkely to be fixed there first (if it exists there) and then backported into this and others..... I've actually seen a worse bug with direction keys being "stuck", that might prompt a complete replacement in any case.