If you'd rather have your own copy, you can buy both digital and CD versions from the Supergiantfor $9.99 and $14.99 respectively. The soundtrack was composed by Darren Korb, with vocals by Ashley Barrett.
Transistor launched yesterday on PC and PS4. You play as Red, a famous singer in a city called Cloudbank who finds herself under attack from robotic assassins, and comes into contact with the mysterious Transistor sword. Combat's a bit of a mix between real-time and turn-based, with Red able to enter a 'planning mode' to set up her combination attacks. Here's the launch trailer.