This was fun. Great concept, good execution and entertainment. I'm wondering if for sake of scoring fairness it wouldn't be better to remove randomization of objects, since some take less space and are easier to place than others.

The game just stops after some items are places, as there is no visible space on the screen for more items, so I started to stack the on top of everything as fast as I could to get the high score. Camera zooming out would be good idea here. I feel like changing the scoring method would also help, as small boxes are easy to place and score the same points as the bigger ones, which are harder to place.

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.