So many good things to say! Graphics and music are spot on. I love the animation of the character, the weight and momentum of the boxes and conveyor belts. The menus! And in-game bug reporting!
It was just the right length and difficulty for a game jam game, and the hidden sockets was a nice touch. It made me go back and play a couple levels again.
One thing that did annoy me was that I kept trying to use space for jump. I would prefer a different key to be “plug in” but maybe that’s just me.