Not Just Once is a well-written creepypasta choice game. There seem to be just two endings, so functionally there’s just one choice: play it safe, or keep playing it risky. Try it both ways.
There are some bugs. One time through, passages referred to past events that hadn’t happened; another time I was left stuck with no choices at all, thus no way forward. But because I was planning to review it, I played several times, and most play-throughs were fine so your odds are good.
Overall I enjoyed it and recommend giving it a try.