Really solid foundation for a farming sim, which could be expanded on if the player had more control over the farm. Maybe the player could start with just the three wheat tiles, and use their money to expand the farm?
Also congrats on finishing a game in unreal. I don't use that engine personally (my pc would either gain sentience and murder me in my sleep or just explode on the spot if I tried), but I've heard a lot about how steep the initial learning curve is, and this is a fair amount to be able to make in spite of that.