I liked the voice lines with all the different parts of the computer communicating with each other, it added a lot of flavor. The aesthetics and graphics, while simple, serviced the game well. The idea of rearranging the level was also neat and I liked that, when the critic hit a loading screen, the player character would reanimate itself and start where he left off, like it was waiting for the critic to lose so it could go about fixing it. If you ever decide to finish it up by adding the levels you said you weren't able to add, maybe an additional way you could interact with the level beyond adding and removing boxes would be cool as well.
I wasn't able to finish the game, however, due to glitches. I was able to figure out that when I got a black screen that I could just press the left mouse button to continue the dialogue, but I also ran into trouble in the actual levels themselves. The HUD elements (loading screen, directions, etc.) appeared way too big for me and blocked most of the upper half of the screen. I don't think this was intentional or even a glitch with the game itself. It was probably an issue because those elements were readjusting based off of my screen resolution which could either be a problem with the web version/resolution of the web version, or with the game's reaction to my monitor's resolution which, I will admit, is pretty old and doesn't have a common resolution. In the end, I had to stop playing because of a glitch that stopped me from picking up or placing down boxes (I had similar glitches with my mechanic beforehand, but none were game-breaking).
Anyways, I could really tell you had a blast making this and I'm glad that your enjoyment seeped its way into the game. Good job and good luck with the jam results. :)