Z and x works only for English keyboard layouts. Most games use this, but it's generally a bad idea, as that makes them very uncomfortable for other countries. the z button is at the middle-top on the keyboard in Germany f.e.
ah, ok. well that's also a matter of getting used to something / preference. celeste, maybe the most famous game with a dash, also has c + x as default. i could make z an additional jump button, but for now it will stay that way :P
