Quoting you from your response to another comment:
"If you go too fast (or use a macro to do it for you) it won't work as well. You just need to go at a quick enough pace."
Remove this feature, it just doesn't make sense. Would you like to play a game where you lose for being very good at it (and not cheating)? Finding that "quick enough pace" seems a matter of sheer luck.
Love the game (would be 5 out of 5 stars), but the X mashing issue is f**ked up.