I feel like if you made the timer 90 sec instead of 60 sec the game would be much more enjoyable.
I just added a QoL update where reading something that takes up the screen (Books & the Door Note) will now pause the timer. So you're now you're able to take your time with reading those books rather than having to fit it within the 60 second cycle.
Unfortunately 90 seconds would allow you to brute force through the puzzles.