This one's a classic. Before Covox went half-EDM, he made straight-up GameBoy music with a loud-garage mastering aesthetic. The "Infiltrator EP" was put out at the tail end of 2007, and includes some pretty heavy, melodic bangers. Closing anthem "Switchblade Squadron" is probably the most accessible and recognizable, but the atmospheric table-setter "Psychic Youth" is worth checking out too. "Jet Alone" is a personal favorite of mine, with great build-up and a sweet bass-melody interplay. While not flawless (the repetitive "Kickflip" comes to mind), the EP has some of Covox's best work to date--which is pretty good for a six-year-old release.
You can grab it for free at the FMA: http://freemusicarchive.org/music/Covox/Infiltrator/