I think this game has some interesting ideas, but they're largely ideas I have seen before. The first two levels should be condensed into one, too much time spent moving plain boxes and back tracking.
The one idea that I don't believe I have seen before is the resizing boxes that are stationary. This should have been the focus as to make the game feel more like its own.
Presentation is solid, I enjoyed the glitching computer messages.
After falling down the huge tower for the third time in stage 5 I gave up. I think for a game jam game it would be good to just have all levels unlocked by default so if I feel like I get it, I can move on to see what else there is on offer.
Overall, well done!