Funny game.
Bug or feature ? to go left you can move fast by keeping left press, but it doesn't works on the right side, you have to press right multiple times.
This is the first I'm hearing about it and I can't replicate it myself, so I'm intrigued by how that's happening! Are you perhaps not using a QWERTY keyboard?
Effectively, my keyboard is Azerty, but usually Godot itself deal with it with using the physical position of the keys.