It seems that if you die and go back to hub, sometimes a glitch happens that lets you skip level 1

Interesting. Obviously wouldn't be allowed in a run but still an fun find

Me and a friend figured out how this happened. The game saves a "unlock next level?" state when you beat a level. if you beat a level you already beat, the game doesn't use up that state and you get to keep it. You must have went back to title screen and started a new save. I show a run where i did this to skip all levels but 1 in another thread, but didn't know the state was carried even to other save files!