I created maps of all the stages, which can be found here: https://drive.google.com/drive/folders/14guVXGd0Wz7V_M5677uAo0i8wMnwoDpu

These were generated from the game files and so should be complete and accurate, including item and enemy placement.

The subdirectories also contain images representing each level's collision data, which have been useful for glitch hunting. I collected a number of exploitable clips here: https://www.youtube.com/playlist?list=PLqfoQUYkMNUadViG7fS-gEZi_cuU-0afR (most of these were only tested on emulators)

Pinning this thread as its important information honestly and does help a lot in routing through the maps of this game.