You may or may not already know this but one of my little side projects is writing video games with a couple of friends: Dean Edis and Jose Cubero over at Gimpy Software. As a bit of a spin off of that I've put together a compilation of 11 Royalty Free pieces of music for video games. From quirky 8 bit/chiptune loops to orchestral and atmospheric synth based themes and melodies.
We've released these as a Game Maker Asset which you can purchase over at the Game Maker Marketplace here: https://marketplace.yoyogames.com/assets/2167/gimpy-video-game-music-vol-1
So there you go! If you're an indie game dev and you're currently using GameMaker then check it out.