there is way to much space left blank, look at the blue circles: You could add some more cool stuff in there, The red stripes: You could move the buildings to the text, Black stripes: You could add some cool other things to it (lightning, Lanterns, etc.)
I think it’s great! I don’t recommend adding more clutter to it, it would look way too “full”, simplicity is key, trust me, I’m studying graphic design at university
Eh. The cloning of the same buildings and all the same colors is just really bland. The buildings are all just the same mirrored image. Not very creative(haha funny pun). Try mixing up the colors, and change around some positions of the buildings and add a few more.