I love these kind of puzzle games and the pushing blocks through walls mechanic was really cool!
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The walls are meant to be like a void tile. However, I can understand your confusion as when you look at all the art together, it makes zero sense. A robot goes through a dungeon, pushing boxes off into nothingness while going into portals and pressing buttons. I realized the zero coherence like the last day lol. I played and rated your game and I had a blast shooting the monsters in the face and dashing through them.