In the folder C:\Users\\AppData\Local\BladesOfTime loof for a the file settings.blk. This file can be opened with a plain text editor like Notepad.
Within this file, there's a section called "game_start". Modify the following variables (or add them if they are not there) to enable the cheats.
|One-hit-kill enemies. May prevent from completing some tutorial events if they require you to lower the health of an enemy.||devastation:b=yes|
|God mode. Does not prevent scripted deaths like falling into pits.||godmode:b=yes|