Thank you so much for playing and leaving feedback! We definitely need some kind of guidance/hint/recovery system for if the player gets stuck on a puzzle. As well as tuning the difficulty curve much better (similar to the witness).
For the re-mi -... -fa - sol gang: The twist in this puzzle is that you should not repeat the melody, instead you should fill in the gap in the scale they are playing with a '3' note.
To clear the spiders there is someone in one of the accessible rooms that teaches you the trick!