Maybe check out GMTK's platformer controller scripts for Unity if you haven't already here https://gmtk.itch.io/platformer-toolkit it even has an interactive game to get settings to make it work like Celeste.
Maybe check out GMTK's platformer controller scripts for Unity if you haven't already here https://gmtk.itch.io/platformer-toolkit it even has an interactive game to get settings to make it work like Celeste.