I'm not critizising the difficulty of the jumps. Off course they get easier when you learn how to do them or get more used to the specifics of movement. The problem is that they are only one half of puzzle. The other half is figuring out how much energy you need. So the learning process is "is the energy level wrong or am I just not doing the jump correctly ?"
The quality of a puzzle ultimatly comes down to it's mechanics and the ones you have in your game are just not that easy to work with. The steam only interacts with the player. The Lava only interacts with the Player.
Maybe you should have gone the systemic route. Let's say fire powers the cauldron and the steam can be used to let objects float in the air. Then let the player pick up the fireplaces and place them down. Lava is like a fire but stationary. Then add some sort of button that needs heat and you probably can see how this opens up many possibilities for intresting puzzles that don't envolve some trivial solution followed by a platforming section.
This is just an example though and you could probably do a lot with the energy mechanic.
Someone in the comments below posted a link to a video by mark brown were he talks about the importance to seperate puzzles from skill based platforming.
And yes. A lot of people will not finish your game when you make the puzzles too difficult. But what's the point then. If you want to make a game then you should make what you want to make in my opinion. Even if most people are not going to finish it. My game is a precition platformer on a timer. It's stupidly hard and super stressfull. But I put all my effort in making it the best version of that particular idea. And for the people who want to get invested in your game , they will find something worthwhile hopefully.
That's just my opinion on that question though.
And the hint you gave for the level kinda confuses me. Am I supposed to go over the the top of the level ? because I tried that and I thought there was a ceiling there. But I could be wrong.