If I understand how the story is being written, then currently there are 4 active paths (A, B, C, D). The path you choose are based on 2 choices: Day 8 choice, and Day 10 password.
Every other choice made is a Route. Some (probably most, but not all) route choices ultimately do nothing to change the story, but give added text, or other bonuses (like CGs). An example of extra text are on Day 1 when you explore, you can change the order of exploring and get additional text. This text does not change the story whatsoever. There are Route choices that definitely change the situation, but do not change what will unfold (On path C/D Day 11 Choice, Path A Day 11 password, etc).
Some route choices and both path choices lead to additional information of what is going on.