Ahaha, I don't know what to say: the two wind-based levels you mentioned are inverted in the game jam version, but after showing the game to some friends, they all told me that the first was more difficult, so I decided to invert them in the updated version. Difficulty in a puzzle game can be subjective, so I think I'll leave them as they are in the last version.
As for the difficulty curve in general, I admit it can be pretty rough, but it is sorta of intended. Maybe I could add some more levels to ease up the transition a bit, but I generally satisfied about the tough gameplay.
Anyhow, I'm really grateful for the time you took just to give me your feedback again. Thank you, I really mean it