Frame rate continued to drop, and the visuals are really hard to tell. In other words, this isn't compatible for the web. I can't really see through the portals, until I'm really up-close to it. Which is a bit of problem because this is pretty difficult to navigate through. Portals that were placed on areas where I could fall down into the void were impossible to make. I couldn't build any speed to make that jump, which was frustrating. Also, after going through some portals my camera continued to spin out of control and I didn't know where I was going, until I spawned back.
Also, I don't know if Valve's music is opensource for the public to use on commercial or personal products. But pretty bold move to take one of their soundtracks, and not credit them or the composer with the rest of the team on the main menu.
Level design definitely needs more work.