The Newgrounds Portal is at war with itself!
The trials and tribulations of a superhero kid and his evil twin.
Behold, it's Captain Low-Rez! 25 pixels of spacefaring courage!
When you beat Portal you're treated to this song. It's called "Still Alive" by Jonathan Coulton (http://www.jonathancoult on.com/). Loved it so much I made it into a video. Enjoy!
Edit: Added in music credits. Thanks!