Thanks. I was able to finish level 6 and the quest yesterday.
My whole issue was that I spent over 2 hours, tapping every wall and pushing every block in level 6 because the boomerang trigger as shown in the photo, which lowered the barrier to the keyblock, was hardly showing on the screen. I would consider moving it maybe one spot right and one spot up. The skeleton guy acting like you needed to achieve some sort of quest objective contributed to my confusion.
Moved the boomerang up and right as suggested.