As someone with a QWERTZ keyboard it is quite annoying to play. Game looks good, although sometimes there is text which you cannot read very well.
I found that pressing every key as fast as possible was a quite simple way to get a high score ;)
This is an easy fix though, instead of love.keyboard.isDown use love.keyboard.isScancodeDown, and instead of using the first argument of love.keypressed/keyreleased use the second argument (the first is key, the second is scancode)
Docs for you: