Thank you so much for playing the visual novel! :) And thank you so much for writing a comment! I'm happy you were totally immersed in the story!
!! SPOILERS
That scene was hard for me to write, too. I think I made myself sad during a lot of the scenes I wrote for True LOVE. But I'm glad that the emotions reached you!
And yes, I left it vague enough for people to headcanon what happens afterward. :) There's a chance for Frisk to come back and reset. There's also the player that can reset. Maybe the player will find Sans on the surface. Maybe they'll go back to the Underground to find him. We may leave the world when we close out of the visual novel... but the story doesn't have to end there. I wanted each of us to bring a piece of it back to reality (if we want to) with our own idea of how the love story continues. :)
In regards to why we're injured during the second run, yes it's because we're "heartbroken." At the restaurant, our SOUL connects with Sans... but he walks away. And the pain of that is what drops our HP.
Thank you again for playing! It means so much to know this is one of your favorite visual novels. (And don't apologize, your English was good! :D)