In level 8 you learn that you can jump higher by starting higher even when the steam is providing some updraft. You can use this in lvl14. It is intentionally a bonus level because it is a bit unfair and does not provide all the information necessary to execute it, only hints at it. (Look left)
I see many people say the controls were difficult and too fast, I didnt notice it for myself during development even though I played it a lot. Sadly there is no chance to playtest a lot during a jam.
Some of the tricky jumps become trivial if you figure out a good approach to them, I would consider that a puzzle in itself. To tell you the truth, I am not 100% satisfied with the puzzles either, most of the time I found them too trivial, but I also know that people wont spend so much time on a jam game to figure out very difficult puzzles.