I completed the game and the other more final ending.
Admittedly the hints were hard to pick up on and I found myself struggling for feedback throughout. I couldn't tell if I was making progress and though I eventually figured out all of the secret rooms, I never figured out what to do with the deeper secret until I had discovered what the hint was trying to get at and how to even 'activate' said hint by skimming through your dev-log.
The puzzles are solid brain twisters and well done, but the hints were not clear enough and inability to progress are likely to leave most players in an unresolved and frustrated state.