I'm glad the game warmed your heart! Thank you for playing it! And yes, I'm definitely enjoying a good rest!
!! SPOILERS !!
If you RESET after the very end, Sans won't be hurt... so long as you choose not to use the knife and FIGHT. In order to get a bad ending, you have to hurt everyone on purpose. So don't worry if you're going to RESET! Just resist the temptation to FIGHT, and nothing bad will happen! :)