When play testing Poltergeist Prodigy, I considered using an energy bar that would limit what scare abilities you could perform. In the end that felt like it hurt the power fantasy of being a ghost so interacting with everything whenever you wanted won out. store.steampowered.com/app/3454810/...
You are a new ghost, and to continue existing and uncover how you died you must haunt the living. Delight in being a mischievous ghost in this first person haunter.