Compliments to the dev. The exhibition genre pretty underrepresented right now but offers a lot of gameplay opportunities.
I'd like to ask which direction you want to take this game. You cited Hitman as one of your inspirations, but going back a bit further, a Tony Hawk style progression system makes perfect sense for this kind of game (and to be honest, the modern Hitman achievements since Absolution are basically Tony Hawk likes). Basically, every map has a checklist of goals, which can be straight up score runs, but also something more specific goals like "Lead this specific character for x meters/to this location", "Scatter this specific group of punks and get away successfully", "Get the attention of this super persistent character and survive for at least x hours", "Level x Orgasm at this hard to reach spot", or "Drop clothing at a variable amount of predetermined spots" (with later maps probably requiring a larger amount of pieces than the standard outfit has) - you can go nuts there. Every goal credits you with a set amount of points, and reaching certain milestones unlocks goodies, cosmetics, and eventually more maps with their own set of goals.
On the technical side of things, do the NPCs have schedules? As far as I can see, they seem to walk on determined routes, but kinda randomly so. For this kind of game, that would be one of the things I'd tackle early since this would be one of the way to give the maps character, and would also set up a lot of achievements that require (at least some) reliable NPCs.