Really fun game! I had a lot of fun playing through it.
Although one thing that could maybe be slightly improved upon is making stone more relevant. Especially at the end game, wheat is by far the hardest resource to get enough of(its also the only thing used to hire new goblins), and the only way stone helps with that is by slightly increasing your wood gains, which in turn even more slightly increases your wheat gains, so it only gives a few percent more to your wheat, so it is just more efficient to have your stone workers get wheat (as long as u have your stone milestone and all the cheap stone upgrades)
sorry for making u read an essay but i'll love to see where this game goes! (if it gets any updates)