I bought this game a year ago (and Itch says that it was acquired then) and played about half of it. I wanted to come back to the game and hopefully finish, but now I only seem to have access to the demo. I also don't have a Steam key, although I gather I should have one.
[UPDATE] I seem to be able to access the game via the Itch website, but not the Itch client. Also, I've managed to get the Steam key so that's solved at least.