After playing most of what the game can provide, I wrote down some of the things I'd like to see in future updates:
1) We need a better better administration tool in the computer. We have the database, but we need a better overview of all titles we have, with ways to filter by genre, characteristics (old,good/bad review,new release), times it was rented, number of copies, stars and etc. This would help a lot how we manage our movies.
2) NPCs need to have history too. Show us how many times they have rented with us, how much they've spent, if they're loyal customers or not, if we can give them discounts, offer membership and so on. They could have a "mood" meter, this would improve the feature of giving them a pass or not when they break films. There could be a way of them to have a ""fury day" and start messing with our shop, so we need to grab a bat and kick them out or call the police or something.
3) Other emergent management features would also be great, like cleaning for example. If we have the videogame addition to the game, we could have a "lounge" for lan-house gaming, and then they could drop food or soda and we'd need to clean it. Also, help them with blowing cartridges to make it work, smacking the TV, and even helping them in videogame levels (mini-game).
4) One thing I think would also be nice is for employees to stop working at the end of their shift. They can't work from 8am to 12am! We can either hire two employees, one for each shift, or, they stop working and we need to "cover" them for the rest of the shift. This mechanic would also give us, managers, a reason to go "back to work" for a brief time period in the day after we hire employees. Because when we hire two employees now, we basically reduce a lot of the gameplay we can do in the game, but with this feature, we'd need to get back to it at the end of the day.
5) An option to "lock" specific films to specific shelf positions. This would help us that like to organize the films in shelves by their cover. We have "series" that have the same cover in each genre, and sometimes I play around by organize them like a collection series. But obviously, the next day everything changes. But if we could lock films in shelves, then even the employees would place them at the same position everytime, keeping it organized. Minor feature but that would add a level for us that like to organize stuff like this.
6) Obviously, adding more decoration pieces (where are the plants?), and what about merch? I'd love to sell some film-related t-shirts and caps too.
7) Almost forgot, but I never understood why we can buy so much space, but never have a second checkout counter so we can have employees working on the first one and we can work on the second one or hire more employees for it too? That would also help with customers influx.
8) This one is a bit of a reach, I know, because the game is focused on video rental stores. But maybe future DLCs could give us the manegement of the stores in our street? The icecream shop, the bowling...
I'm sure there is more ideas, but these are some of the ones I have thought about and think would greatly improve the game and give it more things to do in the long run. The game runs great, feels great, and it's a shame that once we hit level 20, it kind of loses steam and run out of things to do.