Transistor is out today for the PC and PlayStation 4! The game is pretty great, and I've been enjoying my time with it so far. I'm especially loving the music, from the soundtrack itself to the fact that there's a dedicated hum button. Yes, at any point (well not during fights) you can just press the hum button and hum away.
Of course, you can always stream on YouTube and Spotify as SuperGiant are just nice like that. You may want to hold off on listening to the music at least until you start playing. Some of the songs (like "We All Become") are better to hear in-game for the first time to really get the impact of the wonderful themes.