Great idea and good execution. My main issue with the game is the movement controls: when you stop pressing move the object/person keeps walking for a while longer. A more minor issue is that in level 2 the wall cannot move, but in the other levels it can (inconsistency = bad). Perhaps you can also add some background music and boot me to the main menu when I've completed the last level (instead of to level 1).
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Thanks for the feedback, inconsistency was something I was thinking about in my design, to another type of block that has not been implemented which is the gray block, this could not even be moved (more inconsistency).
But I don't consider it a bad thing, in this case, I think of the blocks as powerups. And I think that not limiting things would make the creation of level design more difficult (long term), with the player creating the same solutions for "everything"