I decided to change things a bit.

After killing the HOUSE(ye later on i'll make a boss fight with the house's heart,the monster we see at the beginning), you'll get the front door key,the TRUE front door,since the one we enter is the backdoor,after escaping you'll find yourself stuck in a forest,finding another cursed place,but it isn't a mansion,it is a big house,on the outside: seems normal. in the inside: totally not normal.

If i give more information its gonna be spoilers and all but,yeah thats all.