i would love more spookyness and jumpscares, maybe im alone in this but i think it fits his charachter. and in my opinion, having lots op options to choose from in the dialogue is a good thing! even if it doesnt add to the overall storyline it makes the experience feel more personal.
basically, the more we get to talk to vance the better. i dont know how much you want to expand the game but i would also love the introduction of other charachters or to see more of how vance interacts with the world, maybe also get to know how he spends his time in his realm of existance.
i would also suggest sticking to one art style as some of the sprites were way more detailed than others, i actually liked the simple art style vance is drawn in and i can imagen it is easyer to draw more sprites in that style. please dont feel pressured to include all this im just trying to give you some ideas if your short of them but if you already know what you want than great! its your game : )