Since this thread is about aqua, If I made the weird route for chapter 5, I would have had made Aqua one of the choices for the final boss of the chapter. Flowery gets frozen early on.
The reason why I also had Aqua as a final boss is because I wanted to repeat the sans fight at the end of the UT genocide route, considering the amount of Undertale references in the chapter, but this time, have Aqua be a parallel to Chara, due to people wanting a chara fight, as well as Aqua being similar to Kris and Kris being similar to Chara. Maybe if you spare Aqua early on in the game, she’ll not appear again until she shows up at the end with all of her eyes open. Maybe she saw (YOU)r violence to others and got influenced to do the same to (YOU), like Chara got influenced by the player’s choices in Undertale. Maybe she shows up killing Asgore in front of (YOU) when he is about to fight (YOU) and Noelle. Her theme could also be some remix of Megalo Strike Back.
(*Also, if I was Toby, I would have added Moonsetter as a song in the game.*)