I conscientiously avoid playing complex brainteaser levels, my brain just can't handle the extra load after all that software design and coding
But one thing you may want to consider is using passable wall blocks for those two "wall tiles" below that red block on the bottom segment. The wall tile is still supported to allow custom "shapes" for boards like you did with the segment divided, but if it's just one or two tiles in the middle of a puzzle often the passable-wall blank has a somewhat more polished look to it.
Of course, people might be confused and think that you have to clear them to achieve the clear-all-blocks objective (you don't have to clear them or plastic or anything else that is truly un-clearable).