haven't been playing for long, but the game is very cute! I like the character behind the employees. the game does happen to be a bit bare in furniture but that's totally okay considering the timeframe.
1. more furniture would always be great, like maybe couches for relaxation or voyeurism-- maybe even st. andrews' cross, bondage platforms, drink bars, and swings. more options for already existing furniture would be good, too.
2. decor would be wonderful if you had the time, such as potted plants, toy stands, neon lights, erotic statues, and water coolers for well-needed hydration.
3. the sudden influx of customers in the beginning is intimidating to new players. i think it would make much more sense for your reputation to control how many customers are interested in the place. it adds incentive to keep reputation up.
4. for people like me who stress over my furniture being symmetrical. . . the free-rotate has me sweating! especially since you can't move objects once they've been placed. i think having a toggle button to snap objects in a grid system and/or the typical 8 directions would be great!
5. also, i would request a door. i don't need doors for every room, but instead this door would be like. . . the "set" entrace, y'know? like if i put that door and a bench in an empty lot, people would walk through the door before they would make their way to the entertainment. the door of course would have to be two squares wide to prevent blockage.
off the top of my head, this is all i'd like to see put into the game! even so, i'm excited to see what YOU have in mind.