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Okay so, this isn't really a problem I'm having, but just a question.

Someone recommended me this script for saving and loading:
What I like about batch is how I understand it. It makes sense to me, like if you do that then that happens and so on. But I dont understand how

for /f "usebackq delims=" %%x in (savegame.sav) do set "%%x"

works. What does it do and why?

The command 'Set' when executed with an argument outputs all variables that have a name that begins wit the argument.
'>' Is a redirection operator in batch, so the output of Set gets redirected to the file.
The for loop read the file on a line by line basis and assigns all variables read from the file.

Another way is to reverse the process a bit and use the for loop when "Saving" the variables:
>"%TEMP%\%~n0_Save.cmd" (For /F "Delims=" %%G in ('Set #')Do Echo(Set "%%G")

Then to load you can just call the cmd save file.

The usebackQ in your posted example should be accompanied with quoted filepath in the For (SET), which ensures the command doesn't fail if there's spaces in the filepath.