there's a mechanic I'm missing here. I also can't get past the last two doors after entering the house. I'm guessing X is related, but what does X even do?
Regular doors can be unlocked by pushing or carrying a key toward the door. The solution to the first puzzle is, in rot13: Cvpx hc gur svefg xrl, gura chfu gur frpbaq xrl vagb gur gbczbfg qbbe. Chfu gur arkg xrl vagb gur pbeare, gura haybpx gur qbbe va gur fvqr cnffntr. Cvpx hc gur ybjre xrl, haybpx gur qbbe arkg gb vg, gura hfr gur erznvavat xrl gb haybpx gur svany qbbe.