It Gets So Lonely Here was probably my favorite visual novel, and I'd consider it right up there with classics like Fate or Steins;Gate. The shorter nature of it didn't leave anything to be desired. This game feels the same way, where though it was very short it feels like the story was still complete. Any longer, and it might have felt a little dragged out.
The writing hasn't diminished in quality at all since Lonely, and your notes included as always were insightful to the creative process. Both games have evoked a lot of emotion, which I think will leave a lasting impression. The Princess was indeed my (and apparently many other's) favorite character, and so I was overjoyed to see the theme continued in a way.
While I'd love to see more of the world or characters, I'd find it completely reasonable if you have no intention of writing a third tie-in, as this feels like it puts a nice little bow on it. I look forward to seeing other VN's from you when/should they come.