Idea: can you make Undertale Hallow Eve's Hack?
It is a completely new story and timeline that does not have too much connection to Deltarune Hallow's Eve Hack. the story is Varik goes to find a missing child in Mount Ebott. The gameplay is almost familiar to Undertale, except Flowey doesn't appear, Sans only appears in hotland, New Home is replaced with many new areas, etc.