Hi there,
Save data (and settings) is located in Users\[Your Username]\AppData\LocalLow\Manekoware\Catlateral Damage_ Remeowstered. You can open this location easily by pressing Win + R, copy & pasting "%UserProfile%\AppData\LocalLow\Manekoware\Catlateral Damage_ Remeowstered" in the "Open:" box, and clicking "OK".