Hello, first post here!
So, I am creating a game, which I constantly update with new content, but every time I put up a new version, I have to create a new file. Is there a way to save the game and resume the saved file once a new update is out?
Unfortunately not. The save file contains the location and attributes of every object in the game world.
It might be possible to create your own save system using LocalStorage or an external server, but that would be a lot of code. And you would have to make sure you know which attributes you want to save, and which should be replaced by their values from the new game.
If you do decide use your own save system, take a look at this thread. It might help, or it might put you off...