This game is really cool! Really enjoyable gameplay loop, I found myself hooked for a while lol. I got to the 1000 gold cap, which I didn't realize was the end when I was playing, I just thought it would be a good stopping point.
Really fun! The art is pretty good, the music is a nice background sound while I'm upgrading the shit out of my houses, and the mechanics are simple to understand, yet surprisingly didn't get boring at least for me.
One simple suggestion I'd say is about placing buildings. At first I tried placing buildings with left click, and when I did that the building appeared to be placed, but wasn't actually there. I figured out how to do it after a few minutes, but I think left click would've made more sense as a place button. I get wanting to separate the interaction and placing inputs, but there really isn't any time where I would've wanted to interact with a building while placing down another, so I think it would've just simplified things nicely.
One other thing I found was a little bug. Basically if you sell houses/great halls, you don't lose the miners that they gave you, but you get the red crystals back. So you can basically buy a house, upgrade it fully to get maximum miners, and then sell it to get your red crystals back. Of course because when you buy a building the next building costs twice as much this isn't as game-breaking as I thought it was when I first discovered it, but I'm still guessing it wasn't intentional.
Anyway, great game! I really enjoyed it. I'm excited to see where it goes! :)