The mechanic is brilliant, i love how tricky to set the white box in the right place to move another box to solve puzzle.
Level design also great, the difficult is right hard, some quite complex mechanic like "1-way wall" is introduced "smoothly" through brilliant level design. I feel so satisfied after finish a level. And damn, there're so mant levels to play.
Art and music is cool and highly polished
I'm so amazed how many things you can put in a 48 hours project
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10/10 game! Good job!