God Mode is a collection of customization features that allow you to kind of do whatever you want. If you enable God Mode, you get access to the following features (which show up in the game as purple text):
However, if you enable God Mode within a league, you will not get credit for any Achievements. This persists even if you disable God Mode. You can only get Achievements in a league where God Mode has never been enabled.
These options are not well tested and might make the AI do weird things.