Are you supposed to only be able to jump one block high? Even with double jump, that's still only two blocks, not even enough to get past the cardboard box enemy without taking damage. Then when I got to the trampoline it boosted me halfway up the wall, but double jump wasn't enough to get over the rest. That and with the flying enemies/floating platforms at the beginning that were entirely irrelevant due to how far up they were, it felt like the game was designed with a much taller jump in mind