I liked your slanted walls better.
Close Each side by like 2 tiles and add slants the the bottom corners.
See the middle, diving wall. Shrink that by like a few spaces on each side and the make sure it does not reach the left or right walls, but instead the middle left and right walls where the walls make their first turn.
Close Each side by like 2 tiles and add slants the the bottom corners.
See the middle, diving wall. Shrink that by like a few spaces on each side and the make sure it does not reach the left or right walls, but instead the middle left and right walls where the walls make their first turn.