There's a lot I could say but it's not the worst foundation
-'Mine' button says it gives +10, it doesn't, it gives +5
-Enabling Itch's fullscreen would be nice, not unity, Itch.
-Would be nice to read descriptions without having to buy that thing
-Gold/Stone split on buildings isn't the clearest (Could show it above the list of items, between the list and the Workers/Buildings buttons)
-There should be either confirmation to restart, or hide it in an actual menu
-How long is a 'day'
-*Maybe good to have gold numbers a darker shade of red for better contrast against the creamy background
-Maybe a few small translation issues?
There's a million balance comments that could be made, and it's clearly very early on with a long long road to go, but good luck with your classes and thanks for this small game as it is