I understand that you feel satisfied with the story you've told and characters you've built, and now that I've taken time to think about it all, I think I also am. The ending felt disappointing to me initially, but only because I was left wanting more and now that I've reflected on it once again, I finally understand what you meant when you said that it's supposed to "echo", leaving the rest to the imagination of the player. Having a sequel would be nice, but the story is perfect as it is right now. Some things are just best left untouched. I'm glad that you've got your head in the right place and you're not doing a sequel for monetary purposes. You seem like a really neat and wise guy :).
Keep up the great work, I'm thrilled about the upcoming update and I want you to know that you've earned yourself an unconditional supporter. <3