Wow. All I can say is just wow. I wasnt expecting it would be that great at first. I really enjoied the story and the characters who wasnt just left in the background (I hoped to see Asgore too but it doesnt matter). How you made Sans act was very canon and I loved this. I also loved the thing about Sans defense and the Flowey ending.I wasnt expecting to have the power of reset or to do different routes so when I found out I tried them all. After the happy ending I tried the "genocide" and I found really interesting how Sans doesnt fight you until you reset again and again (probably because of his love for us). I wasnt expecting Chara at all but still liked the way you made them and "this isnt the world I know" really add things to the story itself and connect this fan game to undertale "move to another universe". Another thing I wasnt expecting was the ending of the pacifist after the genocide.. that really hurted so I decided to deleted the game and re-downloaded it to play a pacifist and keeping the promise. (By the way, it really hits when Sans call us with our name in both route and contexts)
In the end I really thank you for your work, that was amazing and I cant wait to see the other things you've done and I am very sorry for my english and grammar since it's not my mother language but I really wanted to add a comment there.