Hey I also found something. Before the Eternium Warlord Bossfight when you jump onto the platform to go down, you can create a box shortly before you touch it and jump again. If you do this and don't land on the plattform(land next to the edge with speed) you can move around at the top while the plattform is gone and also jump down and move while falling down to the boss. Unfortunately the bossfight doesn't start until you jump down. Sorry that I can't post a video because I only have this game on the switch and no capture card.