there are only like 2 jumps where I couldn’t do it by simultaneously jumping off a bubble and blowing a new one and landing on it with the single bubbler. one was the triple dog room secret and the other was the button with two blocks roo. which can be skipped by oveeloading the blocking vines on the return path with bubbles. I didnt even realize you could blow the bubbles directly below you until I had the inf bubbler and was zig zagging left and right to slowly go upward.
edit: and I think both are possible just too hard for me. I can do the rooms individually for the 3dog challenge but the screen transitions are rough.