Cool concept, you could introduce new elements into the puzzle with each level such as holy ground that prevents ghosts from moving or physical switches that only the body can touch. The button press ghost form is different from the other ghost mode jam entries which you can leverage into more puzzle types like jumping over a pit and then entering ghost mode so your grave hits a switch while your ghost form activates a 2nd switch or a converybelt moves your grave away so you have to catch it.