I think the biggest thing holding this game back other than the abject troonslop slowly infiltrating is just how much focus there is on shit nobody cares about.
Toby Fox is allergic to focusing on the main battle system of Deltarune and instead we need countless dev hours spent on minigames, more minigames, a whole chapter that is 80% minigame, alternative movement mechanics (a climbing minigame) and of course, alternative movement mechanics (platforming minigame)
Nobody talks about Chapter 3 because of the minigames, those were forgettable.
Nobody really talks about Chapter 4 because of the climbing, that was forgettable.
Nobody is going to talk about Chapter 5 because of the platformer shit, that too is forgettable.
Toby needs to get it into his head that people play Deltarune to play Deltarune, not to play shitty Warioware, Links Awakening, Frogger and Mario.