I gave it "very easy"/"easy" rate. Indeed, it is hard to understand what is supposed to do this or that button, but you don't even need this, because it is not a puzzle, it is just "press&run without thinking" game. Looks like a mess, you just placed a lot of stuff in the lvl. One button - one function, no thinking. I think it is a shame - use a deathly trap in the logic game =)
I hope my blindrun and demo [dl.dropbox.com] of the second way will help u to optimize your map =)

Overlight corridors it is only thing that impressed me at first sight =)

#F4F
Please try my puzzle . It is how should to be looks a good puzzle: hard enough to figuring out but easy to realise and have a secret ;) No tossing, no need a lot of skill like bhop, 100% logical and solvable.

I probably used all possible path X) I think difficulty is 'Medium', the only "hard" thing for me was to remember where was the exit ;)

And in fact you can reach it really quickly : You can reach the turret you see in the first chamber by placing portals only in this part of the map... Then you just kill it an get the ball, put the ball on the ball button and go to the exit ^^

Just for information, some buttons are useless ^^ For exemple those that turn off the lasers temporarly are useless bacause you can walk under a laser by crouching and you can walk besides it if needed ;)

If you are interested, here is my workshop ;)