Thanks for your feedback! I didn't expect anyone to really notice it. :D
I'll work on this map, when I have more time (after my exams). :)

I think the second room is lacking any real puzzle element. I like the idea of finding your way through the maze and locating the portable surfaces. Perhaps that could be the theme of it.

It is also possible to trap yourelf in your map. If you place a portal behind the first button, then walk behind the panels and place a portal on any of the surfaces, you can remove the cube from the button and place your portals elsewhere. Although only a fool would actually do it, it's probably worth removing the portable surface next to the cube, since it isn't really used for anything.

Made it a little longer. Less confusing. The second part is pretty lame though :-/

The companion cube is just there to mess around with the people, because they can't get it. ;) Also the glass sheet is there because you shouldn't be able to just portal there from the bottom room, but you still need the portable walls there to get to the other surprise ;).

I like the element of having to dodge the turret, although the companion cube doesn't make any sense. I would love to see you expand on it and make it a lot longer. Also the large glass sheet in the first room is a bit weird and out of place.