I made a TAS run for this game here:

There are two main mechanics in play here:

1. Rapid movement in topdown mode - when moving in one direction, you can go one tile per 2 frames, or 15 tiles per second (game is in 30fps). This make top-down mode movement much more faster than platform mode movement. In RTA runs, platform mode is preferable because it is faster than a human movement in top-down mode.

2. Ground storage glitch - You can only jump if you are in platform mode and on the ground. You can carry the "ground" state if you stand on the ground in platform mode, and transform into top-down mode. When you transform back to platform mode, you have exactly one frame when your character is in platform mode and also stand on the ground (stored from earlier). In that exact frame you can jump in the air.

This trick can be done RTA, but takes some practice because you need to press the transform and jump keys at 2 consecutive frames for it to work.

Due to how this can drastically change some of the levels, I'm splitting the game into "glitched" and "glitchless" categories, where the ground storage glitch is allowed or banned respectively.