This was so fun! I got a little bit confused when solving 12 Tone Moan's identity just because (spoilers so using rot13) bar bs gurve cbfgf frrzrq gb vzcyl gung gurl yvirq va gur serapu dhnegre, jurer jr jrer gbyq gung nyy gur fgerrgf jrer anzrq nsgre snzbhf serapu pbzcbfref, ohg gura gurve nqqerff, onfrq ba gur 12 gbar zhfvp pyhr, jnf crgrefohet ynar. Nf sne nf V xabj (naq nf sne nf V pbhyq tngure sebz tbbtyr) gurer vfa'g nal snzbhf serapu pbzcbfre gung crgrefohet pbhyq ersre gb, fb gung guerj zr bss sbe n frp naq V gubhtug V jnf trggvat fbzrguvat jebat jvgu gur 12 gbar zhfvp pyhr.
I decided to just try it and found it to be right of course and was able to move on, but just wanted to point out that there might be a bit of a discrepancy there which can lead to confusion.
Other than that I really loved the game!
translator for the rot13: https://rot13.no/