Is it possible to load a game at certain points

[Darlex]

Hi. I just wanted to know if there is a way to make states of a pre existing game so I could load certain menus without going through others. I want to make a modification of Sharp Objects Panel-Attack: https://github.com/sharpobject/panel-at ... HvUlFmYmeh
As you can see, the look of the game is kind of plain, like the font and menus, so I wanted to fix it up with some menu graphics and sounds, but another thing I really want to do is make a custom menu that will open certain menus in the pre existing game and not others. I also want to not include the pre existing characters and instead add a mode where custom characters are batteled in a certain order, like a story mode.
I'm new to lua but I'm learning a lot of it trying to do this. So my question is, how can I create a menu so that when certain things are selected it will load say the difficulty/speed screen in the original game? And how could create a mode that loads certain puzzles in a certain order?
I know this might be big question, and I am planning on studying more lua, but I think its really valuable to know some pro advice.

Is possible, love can do most things that another frameworks and engines can do.
The problem is that you need to code everything by yourself (or sometimes there is a function that do the thing you want...)