A nice game, feels fairly smooth overall. I noticed if you drop a stack of boxes into the drop zone, there's a bit of a buffer zone where you can catch another box and drop it to add to the multiplier before it goes away.
I think the main thing the game is missing is a requirement to pass, maybe with a star system. Right now I don't really feel like my performance in a level means anything. Maybe this is biting commentary on the state of menial work for megacorporations, but nonetheless I think the game would benefit from offering the player a challenge to overcome.
Otherwise well done, it's a cohesive game with a decent simple loop and a fun stacking minigame. :D