Thanks for such a deep comment, these are the ones I like the most, because they help make the game a lot better!
I see you were a bit confused in the game overall, that one's on me. I know an in-game tutorial would have been great, but I didn't have the time. It's all explained in the description but I'll sum it up real quick so you don't have to go back.
The bar on the top is actually the energy bar. If you press space, you become invisible and can go through walls, but it is limited by this energy. You can regain it by scaring the person.
As for how you make progress, once the person's fear level reaches 30%, they call the hunter. Then you have to keep scaring the person without being caught. At around 50% fear level, the person's face becomes worried so you know you're doing it right. Once it hits 95% they flee and you win!
Sorry for the ambiguity and thank you for playing!