might be intended
also i don't know if you have any way to make the game check if its keyboard input or d/x input but naming the keyboard buttons instead of using a/b/c would have helped
maybe even you could just use a special symbol that looks like a button with (A) (B) (C) as i actually tried hitting keyboard 'a' 'b' 'c' and 'z' 'x' and 'c' for a while before i realized it was shift :P