Wow! The game quality here is simply off the charts. I really, really enjoyed the gameplay loop (obviously very similar to Stardew Valley) and the art is amazingly well done. My only issues would be that
a) It isn't really clear what the "end game" is here, so to speak. What is the player trying to achieve? Is it just to upgrade the barn to the highest level they can? If so, that should be made a bit clearer.
b) The connection to the theme is somewhat loose.
Other than that though, the game is loads of fun, so good job!