Fun game, and nicely polished. I loved the menu being in the same scene as the game; that's an effect I'd love to master.
The tutorial kept getting stuck, but I appreciate that it existed at all. Interactive tutorials are deceptively tricky to make!
I appreciated that you left the physics on for the conveyor belt so that the cans could roll around.
Is plastic really recycled by going into a pit of lava? :P
I wish there was a ranking system. I would've liked something to chase, e.g. if my first playthrough had told me "3/5 stars" or something, I would've surely kept playing until I could get 5/5.
Nice job!