Thank you for playing the game, I'm glad you've liked it :D
Now, to answer your questions:
-Yes, in the second part
-If you join our Discord you can check our roadmap where we've got detailed what we plan to add to the game before moving past the current ending
-Possibly. I still can't say for sure (especially regarding the marriage), but we're always trying to add different content to our game, so it's a possibility.