Loads of stuff to play with here but I didn't manage to complete the map.
Aesthetics
Once you get past a small fling puzzle you're thrown into a completely new aesthetic style. I can't fault the looks, everything was pleasing.
Gameplay and Difficulty
Half the time I didn't know what I was doing nor what I was supposed to be doing. I didn't feel like I was solving puzzles - just wandering around hoping for the best. All in all, I stopped playing after 25 minutes. Sorry to complain so much, but here were some of the reasons I was annoyed:
If you're going to introduce custom textures PLEASE make it clear which are portalable and which aren't. There are inconsistencies like bright white 'look at me I'm portalable' metal panels and dark grey 'I reject your portals with malice' panels which were actually portalable. Players shouldn't have to click every surface to know if it's portlable.
These new buttons are inconsistent too - the first one you meet responds only to the player but later floor tiles respond to cubes as well.
The door with the I and III signs was a particular highlight of confusion. At first I didn't even realise that it was a door - I thought it was a place to dump cubes to make something else happen later on in the level.
There were timer buttons with no timer sound.
There was an invisible forcefield which didn't let me past to if there was a cube nearby. What the heck was that about?
Bugs and Mapping Details
* Visleafs are a mess - almost everything appeared to be a world brush. Needs more func_detail!
* In the first room, the fizzler models weren't set into the walls
* Many tick signs were backwards
* The elevator that takes you down to the custom-style area continued to emit it's moving sound when it had stopped
* After fizzling the 'I' cube, another two spawned in its place. I fizzled another and summoned three!
* In the tall room with the diagonal light bridges, the sign for light bridge was drawn behind its supporting brush.
* Somehow I managed to pull the cubes onto the 'I' and 'III' elevator and exit quickly, meaning the lift rose up without me on it.