I've failed all but 3 key presses out of attempting QTEs for over an hour. The bars will be in the middle of the 2nd zones from the perfect zones in the center, but when I press the key it seems to jump back 2 bars to Fail. It seems the only way to get Good is have it right on the 2nd to last tentacle line instead of just in the 2nd to last zone. I'm not sure if that's intentional becasue I'm red-green colorblind, and at the current animation speed I can't tell the difference in the colors. I can tell the red at the ends is red, and the rest all look the same green to me, but that just means I can't visually tell if the colors different. I've figured out the rights spot just by location, but I can't seem to hit it at the right time anyway.
It's not for a lack of gaming skill or practice; I can tap the Shift key in-sync for several minutes, but switching to Enter right above it will get Bad. I've even had a few times where for the moment the bar pauses when displaying the result the bar was full green as if it were Perfect while it said Bad. I've gotten a few Good on the gangbang H-Scene only if it's right after selecting Resist, and the one Perfect was seemingly by chance. I can't do it consistently enough to succeed a tentacle vore.