Crashes/deletes saved games. Unable to complete!

This would be great if it didn't crash and delete several hours worth of progress almost every time I try to play it. Although you are encouraged to build the aquarium of your dreams, you are forced to keep it as small as possible to avoid crashing. I am on the last level and so close to the end but twice (more than that if you count the whole game) the game has crashed and I understand that that happens but usually you save frequently and load that up or load an auto save (the game does insist it autosaves but i'm pretty sure it doesn't) however when you start the game up it deletes your previous saves and pulls up a save from several hours ago. I must have lost about 8 hours and due to this it just won't let me finish. If you value your time DON'T BUY THIS GAME! It's fundamentaly broken and aulthough i'm so nearly there i'm now unable to finish it... The rest of it's alright though.