That's a very dumb idea, and I love it. The concept it really nice, the execution could be a little better (some bugs, level design, but not that much) but I really liked the game. I think there should be more like "tutorial" levels to see what you can and can't do. I had an issue where I got Mr. Back stuck between 2 boxes, it's just a little bug. And it'd be much more comfortable if you could switch between there and back with the same key.