I was wondering if I can make a save feature in the game…
Does this require coding to make it possible?
GD has some actions and conditions related to “storage”, you can save values (numbers and strings) inside files (native games) or browser storage (HTML5 games), then you can read them of course 
Now you can even save whole structure variables, since you can convert structures into JSON string to save it and JSON string into structure to load it 
Check the example “Level editor.gdg” (located in the examples folder), it saves a group of objects and load them on the fly 