Actually, I would drastically change the gameplay to Bioshock 1. I love how it takes place in an Art Deco sealab but, in retrospect, the execution of this game was terrible.
For one thing, I didn't like how the game had a theme park structure like a hospital level, a garden level, and an apartment level where a major function of an entire city is served entirely within these locales. The introductory stage had an organic feel with how you'd start off at a bathysphere port, then a few waiting rooms, a restaurant, theater; it made it more fun to explore when you weren't sure what you were going to come across next (it also had very high ceilings. Those were nice). It should have had an open world, like some sprawling crawl-tube maze or at least a semi-open world like in Dark Souls.
Another thing about Bioshock 1 was that the gameplay was watered down from System Shock 2. It needed an in-depth system for inventing items, weapons, and ammo and creating new genome sequences for your Psionics so I would have made the gameplay that more complex.