Great use of the theme, very polished game considering the time constraints. I found it a bit confusing that the first guy you get has a reset power that is of no use early on, probably would've allowed all knights to move the boxes and give the reset power to the original hero.
Having said that, it was surprisingly addictive, I didn't want to spend more than 20-30 minutes with one game so I have time to review as much as possible, but this one sucked me in and I was still pushing boxes around an hour later... :)
Got a bit repetitive by about the 3rd level as it's essentially the same puzzle with small variations in every room, but I can certainly imagine how the idea could be expanded to add a lot more variation. The menu music is awesome and the background art is great too. Excellent work all round!