If you have more details or a specific context about "Unleash the Light Switch NSP D New," I'd be happy to try and provide a more accurate and helpful response.
The mention of a "light switch" and "NSP" is a bit ambiguous. NSP could refer to a Nintendo Switch package file used for homebrew or fan-made content. If you're referring to a fan-made game, mod, or content related to "Steven Universe" involving a light switch, it might be related to a puzzle, a power, or a game mechanic within that creation.
While the game started on Apple Arcade, the (released February 19, 2021) is widely considered the definitive way to play.