Thank you very much, glad you enjoyed it! :B
Grace does have a happy ending for just those two - if you check the pinned post on this board I have instructions on getting all the secrets, endings, and content in the game.
Unfortunately - the ‘when’ is the hardest part, I’m afraid. You’ll just have to wait for it, or pledge on Patreon if you want the news as we develop it!
Probably not a full sequel, but definitely expansions coming at some point.