Original track was "Extrune", by Verran.

Playful acid-DnB remix.  Definitely watery.  Just as well as this song played only in water-themed levels.
It might look like the remix is just named for its level, but it's named Accelleration because Accelleration is the best possible name for it.  Just listen to it and you'll see.

Cool-BlueTaste-TheSun!