Hello! I was wondering if it was possible to do 0 exit on NSO.

Thank you!

Yes, it is! You'd follow the universal credits warp route. Even though you technically do 2 exits in this run, it still falls under the same category. Cloud glitch is actually possible on NSO, but it requires arbitrary code execution setup beforehand, so it's not allowed. This run by adz3_th uses this route, though powerup incrementation will be slightly different if you plan on using the US version.