This was super cute!!! I found it very relaxing to just sort stuff, and I thought the dialogue between the characters was so funny. I loved seeing their little feet wiggle haha!
If I had one suggestion, it would be to enable matching input that's slightly more complex. I found it a bit tiring to play on trackpad, one thing that might be nice is to tap/click the item, and then tap/click the box you want to put it in, instead of having to drag. (Dragging is tough on trackpad!) Another option (which I would totally love to speedrun) would be to do keyboard only matching -- so maybe something like a cyclical highlight going over all the boxes, using the arrow keys or WASD to navigate the board. Enter once to enter the box, and then a cyclical highlight to pick an item inside with another enter or something, and it autoejects you out of that box and back to the box select after you pick. Then you can WASD your way and enter to drop it into a box. I think that would be a really fun set of controls for a game like this! Easy on the hands to make the repetitive motions a little comfier.