I really like the innovation in the mechanic of this game and it's overall simplicity.
But I think the graphic could be redirected to elevate the gameplay, as I found the both the map tile and the black block both represented by one block unit is pretty confusing at first glance. And it's pretty hard to keep track as I move around in the isometric environment, maybe a top down map would help the experience be much more clearer as the mechanic itself has already stands out!