>chapter 5: the field of pink and gold
>on sunday, i harvest the wheat
>art therapy room
>death/scythe element
are we literally going to fight Kris' trauma

>>530202547
The secondary theme of Deltarune seems to be author vs player intent. The Prophecy is a manifestation of the developer's intention, it is an in-universe railroad that the characters must follow. Your choices don't matter because the developer has already decided how the game will end.
The Weird Route questions how far the player is willing to go to defy the author, with all the "you shouldn't be here" and creepypasta tones of the route. Just as Ralsei said, you can break the author's intent, bend the game to your will, but how do you know it's not something worse?
So, normal route yes, weird route probably not. I don't have a certificate of Media Literacy so I can only identify surface level themes.