Hello, what do you mean when you say your save keeps getting deleted? I'm assuming you downloaded the non browser game (Linux or Windows or MacOSX) - does this mean the folder where the save is keeps getting deleted and it doesn't show up on the save folder that comes with the game?
Can you let me know what OS you have? Because it sounds like where you placed the game folder is not letting you save anything because of restrictions in your PC, but I'd need to know more. (if this is the case, then it will keep getting deleted regardless of what else I add to the game, so I'd like to check that this isn't what's happening)