What are some glitches turned features in celeste?

[keen gate]

corner jumps and spike jumps were both also present in Celeste classic (pico8). given they're re emergence (albeit in a nerfed form for spikejumps), i doubt they were un intentional

[gray shoal]

Eg the demo dash, which was (to my knowledge) fully unintentional, but was turned into a feature through the addition of a demo dash button

[hearty cliff]

Iirc there was an unintended prolouge skip on early patches that got removed and replaced by the one we have now

[ebon tendon]

There's two audio ones
1: if you leave a room while the animation/sound of you collecting a heart is still going (2a is one that's not too bad to get), the sound continues until you die

2: if you die while the sound of the badeline distortion thing is still going from having hit her, the sound continues until you die again

Neither of these really affected casual play and were expected to just be found by speedrunners as a fun little thing so they kept it around after it was found in playtesting

there's other things (like bubsdrop) that were found by the speedrun community and not patched by devs, but also not turned into a feature like demos were

idk about anything else

[cobalt sundial]

I believe corner boosts were a byproduct of fixing a different issue with corners where you would lose all of your speed, the devs kinda just left it in as speed tech

[queen harness]

I’m not sure if you would call spike jumps a feature but they are kinda just accepted ig

[ebon tendon]

Also lava tech was embraced as there was a wallbounce leniency patch (idk when) that when released maddy mentioned it’d make lava wall bounces easier :P

[livid otter]

neither of these were turned into features

[ebon tendon]

well depends on what you mean. I guess it was "embraced" by them, or they kept it in as a fun thing for speedrunners to find, but it wasn't meant to be found casual or anything

but yeah, not like adding a new button for it or making it a "feature". I think they both fit in with the general theme of the question on the op would probably be interested in it regardless though 🤷

[gray shoal]

I mean it's an unintended thing that was purposefully left in the game, which is mainly what I meant

Like the demo dash was quite literally turned into a feature, but the audio glitches and other glitches that were intentionally left in are still in the spirit of the original question

[modern cave]

were spike jumps supposed to be possible in the beginning?

[ebon tendon]

Not sure which types you’re talking about, but at least some of it was not

There may also be a question specifically talking about that in there, but god docs on mobile is dumb

[modern cave]

oh cool :0

[cyan jungle]

B-Sides unlocking the next A-side was also unintended I think

And bubsdrop/death warps is now a feature used to get the moon berry

[golden mountain]

corner jumps yes
spike jumps no

[ebon tendon]

Do we know corner jumps were intended? Just referencing the ss of faq above seems like it might not be but hard to tell by vague wording

[golden mountain]

they were found during testing and they were made a required tech so i think that counts as intended

[ebon tendon]

That’s fair. I guess I was considering more of not specifically in mind when making the physics/movement of Madeline (where Maddy calls it finding “unintended movement” during the development of 1a dashless

[pearl crater]

you don't have to bubsdrop to get the moon berry

[cyan jungle]

I know, but I think the death warp is a reference to bubsdrop

[gray shoal]

It's required death abuse