Thank you so much! :)
The game is supposed to reset after the credits roll and it jumps back to the main menu — but I just uploaded a build that has an option to reset it manually if that isn't working. Hope that works!
If you want to delete your saves, you can go to "game/saves" and delete the file there. Save files also reside in "%APPDATA%/RenPy/game_directory" on Windows, "~/Library/RenPy/game_directory" on Mac, and "~/.renpy/game_directory" on Linux.