I've recorded a few level strats in this playlist: https://www.youtube.com/playlist?list=PLFqdBnz4QwH6LfTBUKOScM2phm5Ac5SO9

Execution is far from perfect, but you get the idea.

Edit: YouTube seems to not want to publish the videos...?! I'm trying to fix it.

Edit 2: Fixed.

Updated the playlist to include, among other things, some better boss quick kills utilizing bounce cancelling and Messenger's ceiling strat on the world 3 boss.