Great start to a city builder - got a bunch of core “backend” things down.

With a little guidance and prettying it could really be something I’d spend some time with as I love that kind of “make thing to get resources to build more things to get more resources” loop

The city building concept definitely is there, and I can see something improved coming out of this.
That said, here's some suggestions:
- Basic instructions about the game and controls for the game is a must. It took me too long to understand what is what
- Show the player whatever is selected and where is it going to get placed with the mouse
- Any sort of audio cue is very welcome in general, and it also helps with the understanding about what you are selecting/clicking
- Try adding an objective! It helps locking the player into trying to achieve that goal, and also helps you into developing some sort of game loop!

Cheers!

If this game isn’t “expansion” then I don’t know what is! City building was a great choice. I think your game would benefit greatly from a few minor adjustments. The most crucial, imo would be to show the player where exactly the selected building is going and what it’s dimensions are. At the moment it takes a bit of guesswork or trial and error to understand building placement.

This next bit is probably just because i’m an audio guy. But some simple SFX and background track would make this a much more pleasurable experience.

I hope you work on this further as there is definitely potential for a solid game here.