1.20c is just a small hotfix for the black-and-white filter in The Public Domain (the movie-themed world) being broken in version 1.20.

This isn't the first time I've let an issue like this (turning off a layer when editing the level and then forgetting to enable it again) slip through but so far I've managed to notice and fix them before uploading a game build to Itchio; I'll see if it's possible to actually look through the level data when the game loads and detect these issues automatically in the future so it doesn't happen again.