Very cool! I liked the concept, mechanics were really smooth, and the computer controls were nice. I couldn't get the box to defrost though :(
On another note, we used the same desk model haha.
FWIW, there's a file with hints on the floppy you start with, just in case someone gets stuck (and another file nested one folder deeper which gives you solutions outright in case you get really stuck). Having tried to make a puzzle for a game before, I've learned that there's no such thing as too explicit a hint, as long as you don't give it to the player until they ask.
Glad you liked it anyway, though!