The same thing happens to me but unlike Paper Lily Undertale has more routes to follow, personally the one I like the most is the genocidal route since you experience a feeling of loneliness when you kill all the characters with whom you kindly interacted with they.
However, this is chapter 1 of the game and honestly, I really liked it. The fact that it mixes mystery with horror and some funny parts reminds me a bit of a pocket mirror.
Sorry if my comment was not understood, I am using the goolge translator xD