I have no idea. Let me know if you find out please
I'm planning on adding features like that later on, so players can collect stuff that lets them more easily customize or mess around. The reason it's being put off is because I want it to be a late-game thing. Other than that, I'd probably add a secret skip to later game content so players who've lost their save can get to newer content. ... right now there's a skip kinda like that which Voice mentions next to the map in the level select area.