I gave it a 3rd go just in case I really missed something obvious (like the password being in the first paper), but I wasnt able to read the paper. I didnt even noticed you could input a password in the lock block, since the only way of guessing it is by hitting random keys other than X/Z (which is the text shown: press X to exit/z to burn, nothing about a password).
But at least my feedback may help any other tester to try the rest of the game. So there's that