Add the storage plugin to your game( its already in c2 you don't have to download anything).
Then when the players presses the button to save the game add 2 extra actions, one toggle the Boolean from false to true, or if its an number toggle it from 0 to 1, then as another action select the local storage -> set item, add a key and the variable you wish to save.
When all of this is done, on layout load check storage item for item(key) exits if the key exits then move the load button where ever you want it.
Here how I did it on my game Confusion which you can find on the arcade
https://s18.postimg.org/leeze1cft/Screenshot_8.jpg