I mostly tackled the text adventure game,checking out combinations on the keypad,by combining the information from the qr codes and wikipedia articles.
I think that the sentence "The journey inward begins here" is very suspicious.What picked my curiousity is the fact that inside the game you are specifically told that the map holds the key. When you check out the map,you get the clue that "The journey inward begins here".
The "" at the beginning and end of the sentence means something.It's used so it can seperate the needed sentence from the unneeded information.The part inside is a code,further evidence of it being the fact that without the spaces,its length is 26 letters.
I tried decoding "The journey inward begins here" with
http://www.dcode.fr/tools-list#cryptography most of the tools listed here,however most of them needed something like a keyword to have relevant results.
Suspicious indeed since it repeats in various places. The only match I could find online of "The journey inward begins here" is in an Amazon review of the album "A Passage In Time" by "Dead Can Dance":
Perhaps we need to use track titles, lyrics or the review text somehow, e.g. as decryption key?
Or cross-reference track titles or lyrics with the other hints, e.g. with The dragon guards the key.?