Did you drop the difficulty level down to casual?
You could try CheatEngine
, which is a general purpose memory editor, etc, for modifying values used in single player games. Someone has already configured some settings for DKS
, though not the latest version (22.214.171.124); if it's not compatible it may at least give you an idea of what to look for.
Steam may have a problem with the use of CheatEngine, even with a single player game, so you should probably start the game directly (or a shortcut to the executable), rather than through the Steam client.
Welcome to the forum.