I'll give 5 stars on Adherence to Restrictions... But that logo in the beginning is definitely higher resolution than 84x48. :P
Okay, so serious talk. I don't really understand the why the second phase of each level exists. It doesn't pack a challenge and is just so different from the main gameplay... So the main gameplay. Well, the levels design isn't bad, but I really miss that "Undo the last move" option. It is so frustrating when you have to restart a level just because you push a box to the wrong location accidentally. Especially on a longer one. You should use this rule when you are designing the levels: "If you know the solution to a puzzle, it shouldn't be hard to do it."
Overall, I like what you've made, the game was fun. And funny enough, the main reason I check this game out was the title「死の番」. (Which, if I understand it well, means "Death's turn") :D