Thanks for the detailed feedback Otco!
About the quiz, I wanted to make a cutscene with the explanations, but I dropped the idea and added to the main menu fearing the timeline.
I have no excuse for the audios, I should have taken more time looking for some better ones.
I guess it could have a bit more information about the game progression. I'll keep it in mind for the next time.
The zombies are there because I didn't find any kind of spectre asset. I planned on adding some sort of ghost, but didn't manage to find any with animations, so I went to mixamo to get these. About the scallings... I guess I skipped that accidentaly. Thanks for pointing it out.
Thanks for reporting the crash, I'll look into it if I decide to keep updating the project!