This was a fun physics game. I think some people are saying it's hard because the levels don't introduce new concepts, but instead you have to figure them out for yourself. If you added a guided tutorial where you learn different aspects of the game it would make it more welcoming for a larger audience. Something where each level presents a new game mechanic. You're already doing this (without the guided instruction part) for the most part but set up some tutorial levels that are much easier so the mechanics are easy. You could even add an option to skip tutorial for those who want a more challenging experience. The graphics could be improved and I'm sorry I don't have any specific feedback there as there's many directions it could be taken.

I'm glad it was helpful! If you're feeling generous, check out the mobile game I'm building and let me know what you think. There are free download links for iOS and Android on my game page here.

Thanks for checking it out! Since you just joined, after the first round change you'll get an inventory of crops to sell so that's when you can start trading