itch.io

Hey! Sorry for the long wait. ^^;

The only possible way I know is through the Registy Editor, and this probably work for other games too.

Find the folder "HKEY_USERS", then head to the folder "2-1-5-21-many numbers here" and then find the "SOFTWARE" folder. You'll find a folder called "FalonsoDev". Open it and delete the Cyclus Mortis folder inside. If you play the game, it should start from scratch.

if you don't find the FalonsoDev folder on "2-1-5-21-many numbers here", try looking up at the other folders since they also have a software folder

(btw I deleted your comment due to spoilers.)