haha, yeah if you use the same finger for A and Y, I can see where failure comes from.
With Celeste Z is grab (to climb), X is dash and C is jump. A lot of jumps involve all 3 while pushing the right direction (arrow keys to get 8 directions). Plus it's all double or triple jump combinations with grab climb in between. I'm not used to using ring, middle and index finger like that (on z,x,c) so ugh, tough game!
Cuphead on ps4 looks easier to navigate. Although what's A and Y :p