Not articles, but a favourite Youtube channel of mine is Game Maker’s Tookit. It does informative videos on various game-design topics, like story-telling through level design, how multi-player games get balanced, deep-dives into well-made levels from various games and what makes them so good, etc.
Here’s an example (and the channel’s most-viewed video) - How Game Designers Protect Players From Themselves
That stuff is very in-the-weeds on the mechanics of platformers. If you like that video, Itay Keren's article on the history of how cameras work in 2d sidescroller games is one of my favorite pieces on 2d game construction: https://www.gamasutra.com/blogs/ItayKeren/20150511/243083/Sc...
Here’s an example (and the channel’s most-viewed video) - How Game Designers Protect Players From Themselves
https://youtu.be/7L8vAGGitr8