Sorry, but it don't works.
In my first try I get these "x" and "y", two pages of them :
View attachment 32965
In my second try, none of the saved variables are seen :
View attachment 32969
Side to side, the save file view by my variable viewer mod, and view by your program. My mod works by using the list where ren'py store the variables that are saved. So these variables
are in the save file, despite what your program say. Plus, there's also the (filtered by the mod) variables used by the mod itself, and they aren't seen either by your program.
Worse case, it return absurd values :
View attachment 32970
I "opened" the dm.reelena_med to show you the problem. All the 'dm' thing are objects with saved values inside them, and all are displayed by your program as integers. Plus, there's 89 variables in this save file and your program only show 29 of them ; including the ones related to the sole save file itself.
The game is
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if you want to see by yourself.
I don't know what you think ren'py's save files are, but it's clearly not what they really are. Take a look at the 'pickle' module of Python, that's what ren'py use to generate the save files and what your program must undo to display the real content of the said save files.