Apparently, the game has 34 tracks. I managed to identify most of them via Shazam and Soundhound. All of these musics are license-free, you can do with them whatever.

Aero Chord - Time Leap
Alexx Genesis - Everything Is Gold
Cartoon & Coleman Trapp - Why We Lose
Catas - Blue Shift
Disfigure - Summer Tune
Electro-Light, Jordan Kelvin James & Anna Yvette - Wait For You
High Maintenance & Charlotte Haining - Change Your Ways
Invaders of Nine - Apocalypse (Original Mix)
Invaders of Nine - Don't Go (Original Mix)
Invaders of Nine - Poisoned (VIP Mix)
Invaders of Nine - The Other Side
Itro - Starbound
Jessica Sheri - Outlaw
Jikes & Nori - Let's Fly Away Pt 2
JR Serpent - The Sky's Are Limited
Kasger - Reflections
Kitelife - Kites
Kraedt - Submersion
Laszlo - Don't Look Down
Laszlo - Fall to Light
Ramases B & Soundr - Beside You
Reminisce - A Himitsu
Sub.Sound - Feel The Buzz
T & Sugah x NCT - Along The Road
T & Sugah x NCT - Stardust
Vena Cava & Raya - Tohka
Xavi - Here I Stand
xlParano - Start

7 tracks remain unidentified.
It's interesting that some tracks play much more often than the others. There is one unnamed with words "pain of loosing you" which plays almost never.