Overgrowth
Well, I was trawling through the list of Summer Mapping Initiative maps and stumbled across a rather significant shortcut in this map. I'm really surprised no one discovered in before now. Anyway, I decided to create a speedrun video to demonstrate:
I stumble a lot 
. Despite my general lack of skill, I actually tried what you did (before watching your vid) and couldn't make it. Help me out here, did you jump just before the portal or right on the lip?
To the creator:
I ended up solving the puzzle at least somewhat like what I think you intended (only with a lot of mistakes.) I really enjoyed figuring it out, and I may go back and try to break it another way that I saw but didn't try.
One little glitch, where the gel was dripping from the ceiling, I couldn't see it on the floor, even after I
Overall, a great map, even if there are ways to beat it. Let the players who have the skill to pull off crazy maneuvers have their fun. My only suggestion is something you have already mentioned; cutting down on some of the running around on the stairs.
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I stumble a lot . Despite my general lack of skill, I actually tried what you did (before watching your vid) and couldn't make it. Help me out here, did you jump just before the portal or right on the lip?
I jump just as I go through the portal - more specifically, just before I'm halfway through the portal. Also, I believe it has to be a strafe jump/bunny hop; (IIRC) I tried just doing a normal running jump and I couldn't quite get to the light bridge. Either way, it's certainly not an easy jump to pull off.
I'm playing custom maps and record my first time of playing them. So the run is not perfect and may not use only intended ways, but maybe it can let you see how other people may understand the map or you could just enjoy someone playing this map for entertainment.
Anyways, here is the recording:
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(Link: http://www.youtube.com/watch?v=ikchxoSd9a8)
Also note the video description for more feedback and my signature for additional project information.
Portal 2 Playlists: videos 1-200 | videos 201-400 | videos 401-600 | videos 601-800 | videos 801-1000 | videos 1001-1200
Good map, it should be bigger still with a few side chambers to solve puzzles to unlock the "stairway to heaven". Very good idea. 5/Excellent.
I liked this map but wasn't able to figure out a way to get onto the highest floor - the hallway behind fizzler should probably be used for that. But after a playthrough video I found showed that it is unnecessary and this problem can be solved by portal standing (dunno if it counts when light bridge is to come from the portal). I think it wasn't the intended solution, I even didn't consider it to be possible.
(see 1:50)
Also, at the bottom of the pit, on right side of the hallway the player came from, there is foliage causing texture flickering (or how to name it)...
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Pretty much a good, enjoyable map with good visuals, good idea and nice gameplay. Worth of 4/5 in my opinion - very good, but lacks this little something that would make me absolutely love it.
Also, I have experienced one problem during my replays: it appears that the portal surface next to the light bridge may be bugged. There was two times when I tried to shoot a portal there and the game instantly closed. There was no sound, message or anything; I just aim at the surface, click the button, and the next second the game is no more. It happened first when I was about to create that bridge that goes through the fizzler, and the second time when I wanted to create it under that lower repulsion gel source; always when I wasn't expecting it. It never happened when I tried to repeat this on purpose.
Nice map! I really liked it. Although, you should fix the gloss - there's got to be hundreds of tutorials out there.