I mean mainly the positioning of the keys used especially on a european keyboard. Z for example is quite hard to reach on a non qwerty layout.
Ah, so keyboard is an issue in other regions, that makes sense. For now Idk what to say other than if you have a USB controller you can use that instead. In the future I will try and add in rebind-able keyboard controls.
Another way is to use keys like q and e which are the same on most keyboard but it is not a big deal and did not affect my ratings of your game :)