Cool game, but I got pretty stuck after collecting the portal gun. I was about to quit, but I then got teleported to some room with portals everywhere? No heckin clue what was going on there? Restarting the level was a bit annoying, but the level was short enough to not be too bad. Nice graphics, and a pretty polished looking game.
My favourite mechanic was the wall jump, and I must say that anyone not using that ability is missing out on this game's full potential.