Bug : When you have enabled the autocooker, and you run out of snails, it does not start again when you have enough snails again (think catching snails, autocooker enabled, and it hits below 5, and you catch some more). You have to press stop, and then start autocooker again.
How about making a payout-table for the slots? There is no way to know what you win, unless you get the Octo-jackpot. Maybe make the payout or chance-to-win upgradeable as well, so by saving a lot of money you can win more :)