Hello! We haven’t like officially officially confirmed it (we’re still working out our marketing strategy) but my current expectation is that once we start selling on Steam, there will be a price increase by some amount on both storefronts, but we’ll also give steam keys for all itch purchases past & future.
So: I can promise that updates to the game for Steam (such as adding controller support) will also be added here, but I still can’t 100% promise that there will be key transferability between the two stores (though I think it very likely).