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In that first link, there is an audio file called "dial tone" that has Morse code. It translates to: PER SENTENCE LONGEST WORD LAST LETTER MINUS KEY WORD KEY:DOG

We're aware of the mysterious phone number mentioning KEY:DOG, and so far nobody has commented mentioning that audio file, so perhaps someone can put the pieces together with this new information?

I think the clue that leads to the bandcamp site can be found through a file by snooping around in the linux version of the game. from there you follow the hints and do some math and then you get the final passcode.