I like the idea, and I also like the design on floor 21 of the 2nd tower.
The issue I have is that most of the towers are square. Sure, this would be common in a city but to make a game or build stand out it needs to be unique.
Look at this photo I quickly found on Google. Sure, they’re all pretty square, but they each have something unique about them. They either spiral, or have something different. Try bring that to your builds.
The plaza at the moment looks dull. Keep the fountain, but add foliage.
The design on floor 21 of the 2nd Tower was made by someone who occupies the floor (I let people choose a floor and they can put anything on there) and I believe he said it was based on Star wars.
About the towers being square, I agree that I could have done better. I was definity not pushing my self enough to make unique shaped buildings. The most unique buildings are Tower 3 and 4. For tower 3 there was a lot of negates and unions used to make the cylinder shape. In tower 4, I don’t even know what shape it is but it was a tricky task making everything align.
About the plaza, I plan to update it with stuff you would see in a public place like benches and plants, kinda like the WTC plaza.