1.There is also notes just in case a human falls down and reads it.
2.the true lab is opened
3.the people that didn't get it takes care of the one that did.
4.Meddaton was never made but all the ghost are ok and not one.
5.the bosses are Sans/Papyrus, Undying/Alphas, Muffin and a few spiders and, Asgore and a the human souls.
6.Flowy just wants you dead but doesn't try to stop you.
7.you don't have to leave but you can help take care of them.