itch.io

The prototype was just bundled in as part of the full package, and that was it. You wont get the full game for owning that bundle when it comes to itch, that was never part of the deal. IIRC it has been stated that it will eventually come to itch but, again, you will have to pay whatever price the devs put on it when that happens. If you want it now, go grab it now from the available stores. Hope this helps!