Thank you for your feedback, Raven. There are two reasons why only one choice leads to the "true ending" and why the main character has "modern views."
First, let’s talk about the narrative reason. The main character is trapped in a vision created by someone who wants to see if her values and morals align with theirs. Therefore, if the main character agrees with her father from the beginning, there is no reason to test her in the vision. In that regard, the main character's views are defined from the beginning. Indeed, even in RPGs, players sometimes assume the role of a character with pre-defined traits and/or beliefs. For example, consider the Witcher series.
The second reason is a technical one. The game was created by three people during their free time, with no funding involved. Therefore, the story cannot branch excessively and must remain concise; otherwise, the demo would never have been completed. If we ever create a full version, the main character will have many more choices and will be able to change her views and morals as the story unfolds. I hope that clears up most of your questions and concerns.