If you want to play again with a full reset, you'll have to delete ALL save/persistent data from TWO files -- one in the folder where you installed the game AND one in these platform-specific locations on your computer:
## Windows: %APPDATA%\RenPy\<config.save_directory -- Game save folder>
## Macintosh: $HOME/Library/RenPy/<config.save_directory -- Game save folder>
## Linux: $HOME/.renpy/<config.save_directory -- Game save folder>