Really makes you appreciate the size of it all. Though if you go to the very furthest out and slowly zoom in, it makes you feel unbelievably insignificant. Kudos.
For hard badges you should go for: The Force Is Strong - Complete the Game.
Impossible could be: Spock Would Be Proud - Complete all of the in-game achievements.
Very very unique idea, good use of music in an innovative game, particularly love the add my own music feature. Dubstep, Drum and Bass, Rock and Metal all work very well.
Some of the crescendos hit really hard, and bring some real climaxes to the events of the song, you find yourself listening to the music and trying to predict what the next pattern will be and act accordingly, very good use of bpm.
 "The Scale of the Universe"){kind=icon}
 "Enigmata: Stellar War"){kind=icon}
 "Vector Stunt"){kind=icon}
 "Symphonic TD"){kind=icon}