I've been using an Xbox 360 controller to play Celeste and I've noticed some odd things. Using the analog stick in menus is very sensitive and sometimes results in skipping over menu items or options. Also, using the start button while in a level is very touchy. If I hold it down it will often trigger the opening and closing of the pause menu, unless I release immediately. I don't know if these problems affect the actual platforming, but it is possible. I do feel like my directional inputs may be misread on occasion, but this could also be error on my part.