Really chill music. As some have pointed out, the "A" key didn't work making it quite difficult to play. It was definitely a cool concept and I love the art. Digging 2 squares away seems to be a bug as well.
If you used unity's tile map top make the tiles and then accessed them when clicking you could possibly fix this when doing a check to make sure the tile is < 1 unit away from the player. That is what I have had to do when working with the tile map in this manner. If that is not how you did it, then just ignore me lol.
Still, overall a pretty good game.