Thanks for the reply and feedback, I really appreciate it!
Aside from UI buttons and frames all other graphics are AI generated. It is most visible with the map background which is too low-res as AI usually don't make images larger than 1024x1024. I should look for ways to upscale it.
Right now I'm so hyped about ChatGPT that I considered writing a devlog. But that might take some time. I didn't use ChatGPT for Unity before so I can't tell if my experience with it was normal or lucky, or I'm just good with prompts.
I'd say 80-90% of code was made by ChatGPT. The rest was me doing corrections to it and in some cases it was just easier to write few lines myself instead of coming up with more specific prompt. All generated code also had to be always double checked as it sometimes would rename attributes or forget about some classes it created before. But reviewing the code this was still faster and the end result is undeniable benefit.
For me city demands didn't feel this bad but that's probably because of my awareness how all systems work.
For now I will reduce resource consumption and see if this is enough to get at lease some cities stable.
I plan to add AI merchants too but as you said that will take some time. Same goes for data charts in cities and other useful tools.
And, yeah, how could could I forget about pause on Space bar. Will quickly add that one :)