Not sure if this is necessary to say here, but this game is a goldmine of cut content, to name a few examples: the cut character moon jumper, the early co-op partner timmy, a scrapped hubworld that consisted of a limbo with 5 doors that led into giant hourglasses, a scrapped tutorial (the tutorial battle was repurposed in the barrel battle), an entire scrapped chapter called sand 'n sails, there's quite a lot of cut content, much more than what i mentioned, some of it dates back to when the game was gonna be a hack 'n slash with paper mario-ish rpg elements
i'll link all of it here (also features scrapped music from composers that left the dev team early on) https://www.youtube.com/playlist?list=PLWLTaE0Wg6Ib9_CJEFApaTvnEnHbXMzyj