Added a new saving system to the game so that players no longer have to play the entire game in one sitting only to lose their progress at the end.

There will likely be no new updates for the time being, both due to time constraints and my general dissatisfaction with my own work. I have grown so much as a game dev that I believe I should work on a couple other projects first before revisiting this game, as simply building new levels won't allow me to learn much more.