mouse cant click anything WASD and arrows does nothing nothing is interactable on the screen and you cant do anything with the game?
There is no WASD controls in the game.
For now, the only thing you can do is buy items in the market which is the second button from the left and then sell it to the npc/customers using the open shop which is the first button.
Once, you have opened your shop, you need to wait for the customers to come and then set the prices.