Thank you so much, I'm glad you were looking forward to this update, haha! Buildings start appearing when the production reaches a sufficient level. There's a system that prioritizes which building will be constructed, but with the current balance, it’s mostly houses that increase the population cap for the city.
The ability to make improvements was available before; I just added highlighting for tiles that can be upgraded to make it clearer. :)
As for the walls, yeah, there was a small bug before because the walls and tiles were on different layers, which made them look off.
The tile combo feature was technically challenging, which is part of why the update took so long. But I think I've found the optimal solution, and now I just need to draw everything out. :)
Regarding the resources icons – that's a great suggestion, thank you! When I add the full interface, I hope to find a more elegant solution, but if not, I'll definitely implement it the way you suggested!
Thank you for staying in touch!