It is already like this. After you release the jump button your acceleration increases
Viewing post in Guardian of Arashima jam comments
Ah, I think I'm just misremembering tight corridor wall-jump examples (it's been a while!) combined with not being used to playing on a keyboard. I just booted up Celeste and Guardian of Arishima, and you're right– they behave really similarly. 😅
I was recently playing Dead Cells with a friend, which has a totally different mechanic of shimmying up the wall if you keep holding towards the wall, so maybe that was in my muscle memory!