I have no idea how to code for making flash games in the slightest, but for an auto-save can't you make a if statement that checks if a button that says enable auto-save is enabled then it triggers a loop which then does the save function every 5-10 seconds while also checking if the button is pressed to keep it triggered or to stop it if the button is no longer pressed.
Perhaps this is possible, but it would require to have every single scene to have about an extra 150 lines of code (which isn't a problem for coding,) but I'm not sure how it would effect game performance. When I've tried to do auto save in the past I feel like I remember my current process for saving requiring a button press for the code to even respond, so I'm not really sure. I'll keep trying.
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 "Skills Idle"){kind=icon}
 "Pixel Kingdom"){kind=icon}
Perhaps this is possible, but it would require to have every single scene to have about an extra 150 lines of code (which isn't a problem for coding,) but I'm not sure how it would effect game performance. When I've tried to do auto save in the past I feel like I remember my current process for saving requiring a button press for the code to even respond, so I'm not really sure. I'll keep trying.