Toby Fox is a fan of wordplay and was planning things in his head for years before the first game even started development. There are tons of little details like this.
And 90% of the details that aren’t puns or anagrams are hidden in the soundtrack. Leitmotifs pop up everywhere.
Deltarune is an anagram of Undertale. Never played either, just noticed and thought it neat
Toby Fox is a fan of wordplay and was planning things in his head for years before the first game even started development. There are tons of little details like this.
And 90% of the details that aren’t puns or anagrams are hidden in the soundtrack. Leitmotifs pop up everywhere.