I didn't program in a wall jump, so you might have been using the double jump while you're small enough.
Probably, which explains why I found it hard to pull off reliably. I went back and tried again and unfortunately I'm still having a hard time to reliably to double jumps... probably mostly a me issue but I once again felt a little sad, I really wanted to beat this game, it's so pretty and the grow/shrink mechanics has great puzzle potential! :-)
Personally I'd skip the mechanical challenge posed by double jumps, it seems mostly redundant with a single jump height difference.