"Deltarune" was developed by Fox in GameMaker Studio 2. The game introduces a new battle system influenced by the "Final Fantasy" franchise, contrasting with the original game's combat system (which was inspired by that of the "Mother" series). Some of the music in the game remixes much of the soundtrack of "Undertale", but most pieces are new. The main game uses sounds from "EarthBound", while battle music is similar to "Breath of Fire III" music, and even Lancer's theme is similar to J.A.K.Q. Dengekitai's opening theme. The game also has many similarities with "Undertale" in the name of characters, for example, Ralsei (one of the main characters) is an anagram of Asriel (a character from "Undertale") and Kris (the main character from "Deltarune") is almost an anagram of Frisk (the main character from "Undertale"). The name of the game, "Deltarune" is an anagram of "Undertale." Temmie Chang, who helped as artist in Undertale, served as the main artist for the game, designing characters, sprites and animations.