Need help with demos!

So we have pretty good progress on our game, Pokemon Serpentine, however each time we come out with a new demo, players are forced to download it again and have to start over. Is there a way to get it so we can just send out an update? Or is there a save file that can be moved to the new game? Any help is greatly appreciated.

There's a save file that can be moved to the new game. Game.rxdata

For me, the save file is located in C:\Users\[My Name]\Saved Games