I believe I already told you the main goal of the game is to renovate the church. You found the building in a deplorable condition, and you complete all the quests, do all the stupid shit like exorcising, crafting, killing people, and destroying furniture, just to earn some money to renovate it. Suddenly, after 10 hours of gameplay and 5 hours of crashes, your game is finished, you pimped your church. And you leave a positive review on Steam. Congratulations. I won't spoil it for you, won't show you the renovated version. But here are the concepts of the ruin you start with.
The building is slightly different from that of the trailer. We've added stairs, for example, so you can go up and down. It's so pleasant.