So I'm gonna go on a shorter, stupider rant for this one, purely on the whim of an idea I had yesterday.

(THE FOLLOWING WILL CONTAIN SPOILERS FOR DELTARUNE CHAPTER 2'S "WEIRD ROUTE")

There's an interesting motif regarding DELTARUNE's Dark Fountains, and honestly the game as a whole: Water.
I mean, it's in the name, Dark "Fountain". Even if it's a fountain of "smoke", they still have deliberate connections to water and the ocean.