Not Bad.
This isn't super-great or anything, but it's a lot better than a lot of stuff on the Portal. My only two big complaints are as follows:
1) He stabs him IN THE HEAD. That just makes people laugh.
2) Did you record that guitar yourself? If not, I suggest you throw the CD away. If so (and I think you did), practice some more before you record again, and use less distortion than you would live. What sounds cool coming out of your amp and what is listenable when recorded are two very different things. You may also want to have a drum machine playing while you record, or a metronome, or something that isn't being recorded to help you keep time. It sounded random and jumbled.
But the art was nice, and the vocals in the dream sequence were great. Overall, good job.