The author of one of the backgrounds (Andy Ray - Reinforcement), which is a licensed one we got from Unity:
https://soundcloud.com/muzstation-game-music/action-game-soundtrack-full-preview
The other 2 I can't find details on quickly as my coworker was looking for them, but I believe all backgrounds were probably licensed/purchased. We don't have a great record of this, but the backgrounds are definitely all licensed from Unity and/or soundsnap.com
I could dig a bit more if I got some more time, but that's what I can help you with for now :)
Considering how it is called "Safety Bot" you would think that i would feel safer around it, but noooooo it just has to shoot me with an auto-plasma gun.
 "Infectonator : World Dominator"){kind=icon}
 "Get Off My Lawn"){kind=icon}
 "War Clicks"){kind=icon}
 "Robot Wants Ice Cream"){kind=icon}
The author of one of the backgrounds (Andy Ray - Reinforcement), which is a licensed one we got from Unity: https://soundcloud.com/muzstation-game-music/action-game-soundtrack-full-preview The other 2 I can't find details on quickly as my coworker was looking for them, but I believe all backgrounds were probably licensed/purchased. We don't have a great record of this, but the backgrounds are definitely all licensed from Unity and/or soundsnap.com I could dig a bit more if I got some more time, but that's what I can help you with for now :)