Interesting idea, I kinda dig it and am keen to see where it goes. May I recommend and intro area that shows the mechanic to the player without describing it with words..? Perhaps a series of three progressively shorter jumps, each with a coin after it, and then the chest? After that making a bit clearer and introducing them to more order-of-operations puzzles should seem a little more obvious and you won't have to have your written disclaimer or answer as many questions.
Other things that could be cool to see incorporated into puzzles: trampolines, teleporters, moving obstacles, moving platforms, reverse gravity. Curious to see what the end product is like!