I was very annoyed when I firstly saw how much is it for the hard badge. But now having it finished, I must regret it was not so impossible, just hard as always.
I feel this game is not really about the music. Listening to it does not help me to progress anyhow in the game, I think the best way to achieve the best score is to turn off the music completely...
It's details what makes the game frustrating. The controls are far from perfect
– sticking to wall is slow, you cant roll right from a jump. Plus you are encouraging us to speedrun the levels, but why does the timer not wait for the first move? That causes useless restarting.
However, otherwise it's a good game. Music is perfect.
 "Exit/Corners"){kind=icon}
 "Hat Wizard 2"){kind=icon}
 "Scriball"){kind=icon}
 "Jumphobia"){kind=icon}
 "Music Catch 2"){kind=icon}
 "Tough Growth"){kind=icon}
 "Lucky Tower"){kind=icon}
 "Cube Escape: The Cave"){kind=icon}
 "VVVVVV Demo"){kind=icon}
 "The Illusory Wall"){kind=icon}
 "Mine of Sight"){kind=icon}
 "The Light Temple"){kind=icon}
 "Aground"){kind=icon}
 "Sky Quest"){kind=icon}
 "Robot Wants Fishy"){kind=icon}
 "Run 2"){kind=icon}
 "SkullFace"){kind=icon}
I'll make sure to check the compatibility with Vivaldi again. Thanks for reporting.