It's difficult to explain the pleasant tactile sensations that come with playing certain games. A game's physics are like its DNA; veteran Mario fans have his jumps committed to muscle memory, same as veteran Sonic the Hedgehog fans have a good feel for Sonic's momentum in his Genesis games.
Matt Thorson, one of the lead creators behind the platforming phenomenon Celeste, describes the sensation as "Game-Feel." Celeste is a game where your success depends on running, jumping, and climbing in a perfect rhythm, so Thorson knows something about the magic that gives a challenging platformer that extra oomph.
A short thread on a few Celeste game-feel things :) I don't think we invented any of these. 1- Coyote time. You can still jump for a short time after leaving a ledge. pic.twitter.com/nMK9ZLYbhM— Matt / Maddy Thorson (@MattThorson) March 13, 2020
Thorson shared some of the tricks that make Celeste so satisfying to play over on their Twitter. While many of the mechanics are common to challenging platformers (Thorson admits they didn't invent them), it's interesting to note how forgiving Celeste actually is. For example, if you're a couple of pixels off when dashing to a corner, you'll clip and land safely even though poor Madeline should technically take a quick, deadly trip down to the base of the mountain. The same forgiveness also applies for semi-solid platforms (wooden platforms, for example).
8- You can actually wall jump 2 pixels from a wall. (That sounds tiny but this is a 320x180-resolution game :P) pic.twitter.com/fzm7NOee5p— Matt / Maddy Thorson (@MattThorson) March 13, 2020
You also get a lot of leeway for wall jumps. A regular wall jump will still execute if you're two pixels away from the wall—which, as Thorson points out, is generous for a game that plays in 320 by 180 pixels. A "Super Wall Jump" (i.e. a wall jump that you perform while dashing upwards), you get a leeway of five pixels.
Thorson goes on at length, and all of their information should be fascinating for hardcore Celeste players. I certainly do not count amongst the hardcore, but I respect Celeste's intense challenge. If you're really into the myriad ways Celeste can hurt you, check out our interview with the game's sound designer, which reveals how Celeste was made with speedrunners in mind.