Using the files' content themselves is an intended way to play this game. The way I thought about this is that, I wanted the game to feel good to anyone with any type of comfort zones. Not everyone is going to open the files to look at their content, but the files having some legible and illegible parts gives the people who do look at them a pretty cool clue. In my personal opinion exploring the maze and figuring out what each file is, is more fun to do, but for others just looking through the files maybe more fun. So I think keeping both made good amount of sense, and even with looking at the files you still need to explore the different rooms!
Though the mazes definitely could be more legible. And yeah the same music for long enough time would get repetitive, so having some extra music would be fun ^^ The music itself could also be longer to feel less repetitive.
Though for now my main focus would be soul decode another game with file manipulation mechanics. The file manipulation mechanics here originated there, I only took that mechanic as its main mechanic, since outside the box theme made me immediately circle to that mechanic.
Anyways good to know you had fun with this game ^^ The comment helps a lot to know where I can improve!