If you still got access to your old computer, you can just import the "save"-folder from your game. The path is Small On Top[VERSION]/Small On Top/www/save. You'll need the entire "save"-folder, just put it on a USB stick, and replace the "save"-folder on your new computer with the old one. However, depending on how old your save files are, they may or may not work with the latest version of the game.