Forced advance is maybe the most difficult puzzle in the pack. The extra fairy can only walk, she doesn't have any abilities. I should remove the green lever, it only acts as a red herring.
Synchronized Jumping has proven to be needlessly complex, so I will split it into 2 or 3 different puzzles. But I'm happy you managed to solve it, also thanks for mentioning the strong points of it, I will keep them in mind.
The last puzzle was one where people got stuck in the very very early versions of the game. In hindsight and having watched others playing it, it's two puzzle in one and feels flimsy. Thanks for mentioning stopping a fairy mid-flight happened early on the demo, I didn't pay attention to that. I will need to completely redesign this puzzle.