I like it but could you have us meet sans and alphs love it so far feel free to use some of my suggestion's
I'd have to check my notes, but I believe Sans will show up in chapter 1! So You'll get to meet him soon. As for Alphys, she'll be introduced a bit later, around chapter 3 if memory serves.
I plan to have all the major players from Undertale show up in some capacity, it's just a matter of when!
Thank you so much for your comment!