Thanks for the kind comment. With the Game Jam deadline, I wasn't able to try all the levels in the final version. Things start to be harder around level 31 and after 41 it's really hard ;)
If you're aiming for 3 perfect cover songs in a concert, my method was: Valedico (Guitar 2), No More Dead (Guitar 1), Pick it Up (Guitar 2). Best of luck and Rock On!
Yes, they do. I'm glad you like the ending. :)