This is an excellent start to a good game. I would have made it so the fish would carry the item to the correct barrel and then drop it into the barrel. Instead of pushing it around. I found that frustrating.
I appreciate your feedback. I plan on making this modification and I think it's a great idea. The physics was the hardest part of the game development. If you're unlucky, you may struggle to put even the slightest thing in a trash.