So sorry, I didn't even think about keyboards when making it! What is the problem when you try to use a French keyboard? This is my first game and I don't really understand what the differences could be.
No worries, you couldn't know !
FYI, the keys in French and English keyboards are not in the same place. Imagine playing a game and the keys to walk are in zqsd position instead of wasd position on English keyboard. So usually I switch keyboard language when you can't change the key directly in game and switch in my head the position of the keys, than the "z" for me becomes "w". However, for your game I don't even know where some of the keys could be on the English keyboard like [ for example.
You shouldn't really even consider it as something to care about, it's French people fault by decided to get a different keyboard than the rest of the world ahaha