Celeste's devs created the game while keeping speedrunners in mind

If you're a real speedrunning masochist, you've probably chosen Celeste as your game of choice. Celeste is an absolutely fantastic experience top to bottom, but it's one hell of a tough game to speedrun. You'll need pixel-perfect jumping and button inputs in order to achieve your goal, but boy, will your success be worthy of major celebration. The Celeste dev team knew their title would appear to hardcore speedrunners, which is why they kept them in mind while working on the game. Celeste sound designer Kevin Regamey elaborates in a USGamer interview.

"I'm a big speedrunner, I love glitch hunting, finding the seams in development. So we broke the game in half over and over again leading up to the release of the game. On a broad perspective, I think that we're definitely big fans of allowing players to kind of interpret the media how they see fit. So if it comes down to something like Ocarina of Time, you play it through on your casual playthrough and, if you're gonna never [play again], that's fine. If you play it like 10,000 times and your best time is like 20 minutes because you just break it in half, that's fine too.

One, that casual playthroughs work and be wonderful. Two, let speedrunners break it and have a good time and just toil out for them. And also not just allow for it, but like design around it. [...] So if you know the trick, you can skip this part of the room. And then also trying to bridge that gap, so people that may not have done speedruns in the past, and might feel empowered to try for the first time."