This puzzle has an opening that I like. It's probably been used before by others as it fits very well in a standard grid size. I tried to keep it symmetric, but after working through a big part of the puzzle it wouldn't get unique symmetrically without sacrificing some of the previous logic. As I liked everything I had put in till that point, I went looking for a fun way to finish it. I think I acchieved what I wanted in the end. Hope you enjoy it too.