My advice for new players is to pick a girl and choose every option pertaining to her. Use the skip function for scenes you've already played through for those that are impatient. When you've gone through that characters scenes move on to the next. In this manner the gallery hint system helps with also checking on the required lesbian, affinity, corruption, zeta levels.
I think the mistake is trying to play this game in a linear visual novel type of way.
Time loops aren't linear.
I hope this helps some people. Just remember don't get frustrated and have fun! It's easier than you think.