kkkkkkkkkk I like building games kkkkkkkkkkkkkk
Besides the obvious I want more content, I think adding hotkeys to buying buildings would be a simple but immediate improvement. The building stats can also be moved onto the right with the construction menu, so that the player can immediate confirm the number change when they buy the hammer upgrade.
By the way if you to do more stuff with this project.. I can help with some hammering animations :^)