That is such a great point, thank you for the analysis! Expanding the game to organically teach those hidden mechanics through level design is definitely the way to go. I haven't played Tethergeist yet, but I'll definitely give it a try now to extract some ideas from those movement achievements! Regarding Celeste, I've played it before but never got around to trying the B-Sides. Knowing that they serve as a playground makes me want to go back and continue my save file just to study it. Thanks again for the amazing feedback!