Holy crap Nergal this engine is WAY to laggy and delayed for this breathing game. The other mini game was mildly annoying but this breathing one only works is you interact WELL BEFORE the line hits the sweet spot. I mean look at this I "failed" when it is clearly inside the box.
The visual vs input timing is not something a player can deal with unless their game runs exactly as yours does when you were working out the timings. You should scrap this minigame and either replace it or just remove it. Timing mini games never work for everyone in RPGM games the engine just does not run them well, the best you can hope for is it works for most people.
Edit: that is not even getting into the fact the engine SPEEDS UP when you push the interact button for more than a millisecond. So the bar is also speeding up and slowing down over and over, as you push the interact button/mouse button.