Thanks for playing! Francesco's second chapter is in the works right now, so we hope you have fun with him when the time comes! 💙
As for getting your Steam key, if your itchio and Steam accounts are linked (and the emails of those two accounts match), you should be able to return to the download page and get your key. There should be a link to the download page in a grey bar at the top of this page, saying that you've already bought this game. If not, there should also be a link to the page in an email from itchio after you made your purchase. Follow one of those links back to the download page and the Steam key redemption option should be there.
If things still aren't working for you after that, you'll need to reach out to Itchio's support. As it stands, we have no control over the backend that makes Steam key distribution possible, we only have the power to add or remove keys.