Good question does Itch have an SDK for devs? I'm a Unity dev so having a .net SDK would be great or a simple API would work. Only issue I would see is users would need to log in to the local game using their Itch IO account. Which means the games would need to use encrypted data stream to Itch to prevent data breach. Unity for example allows you to easly communicate with API's. However, they don't require HTTPS. So I guess Itch would have to require users only send HTTPs requests?