I can see the idea being extremely fun if it was expanded and polished a bit more , I often found myself physically unable to continue after stacking 15 items on the shelves due to their being no space left on the screen. It could be improved if u made it so that the camera went upwards to make sure that u could always see the top of the pile , the game could also do with some sound effects because the lack of them makes the game feel a bit flat.
TLDR : Love the concept and the game would be great if it was expanded and polished a bit more.