Pretty cool game. Couple things that might help. There is no way to quit out of the game without just closing the window, might just wanna put a quit button in there and maybe basic main menu for tester quality of life. Also, it's not obvious what some of the buildings are until you build them, maybe add a tool tip when the mouse is hovering over the button to buy a particular building. Other than that, it seems like a nice start to a 2D city builder.