Wouldn't hope too much. As far as I'm informed, there's no contact with the developer. I don't believe there is anything else coming. You can play the second part if you didn't do that before, but it's not as good as the first part.
Same. I feel with you. Also played the game in only two days and even got off work an hour earlier today just because I wanted to play. Now that the game is finished, or at least the part with Sarah, I can't stop thinking about her. Weird what a game like this does to me.
Not sure if you’ve noticed, but "Sarah's House" has received an update. As far as I’m aware, it also includes new content for Sarah’s storyline.