So, i've got the flying off problem figured out. For anyone else who tries it, the issue is that collisions cause forces, and nothingis canceling those forces. So, basically, run into a wall and you can go back to walking around lol. Theres a few key systems that are definitely missing. But you should be able to collect wheat and drop it off at the silo, and collect eggs and drop them off at the hen house (the one the trucks go to). And you should earn money from the trucks leaving.
Which is to say, I'm sorry it's not more cohesive. I was actually quite inspired for this jam, and really do want to make some changes. I think it has potential to be a lot of fun. Thank you so much for trying the game.