It's a little difficult to understand exactly where you're getting caught up, but there is one other common issue.
At the end of each run you can click on the girls on the left and in their corruption tabs you can then activate (or deactivate) any corruption levels you have unlocked.
the game has a complete map of every decision point and check in one of those buttons. In the other there is a check-list of exactly how to progress each character.
