Hello! I was one of the streamers who took part in Feedback Quest, and I'm here to leave some comments I had while playing.
Or I would, but it seems many people have spoken about it. I do hope that you will be able to do more work into this and polish it. I would recommend maybe combining mouse and keyboard, where you click on a can you want to move and then use the keyboard arrows to move it around. Currently, doing it with clicking is slow and repetitive.
That said, I have no idea why some cans change instead of instantly disappearing.