I have no idea if anyone's interested but @Edel got me thinking about making a pixel-perfect collisions platformer engine with Move Safely 2.
I've put in the absolute basics so far, with commenting:safelydoesitplatformer.mfa
It's rough, but it works and it doesn't use anything but a player sprite and Move Safely 2. If anyone wants to improve it, rewrite anything or extend it (my wall-jumping idea could be implemented!) feel free, I'd be interested in anyone's thoughts!