The same as the others, I didn't realize there was a second laser until after working awhile at trying to activate everything with one. Got to within a few inches of doing it, too. I actually got the door open with one laser, but that was while holding a lens cube. I couldn't position it quite right on the floor. I didn't experience all the troubles wildgoosespeeder did, but it must be possible to do so.

LOL Zaeros I did the same thing!

Man wildgoose just rips into anyone who posts a map he doesn't like.

I enjoyed this map, Didnt even see any goo? My main problem was not realising there was a second laser and obstinately trying to exit with just the one. Was fun, Thank you.

DISCLAIMER:
Read my profile before reading the rest of my comment!

This chamber's difficulty comes from how broken you made it. This essentially tricks players into doing things that trap them from progressing further. There's possibilities to lose two of the four cubes to goo forever! Trapping and crippling how the player is to perform the actions needed to exit isn't difficult; it's annoying and punishing! This chamber does everything wrong on how to challenge its test subjects! Here's why:
http://www.cs2bus.com/workshop/discussions/-1/882949475710689142?appid=620

Here are chambers (250+) I have found that are rightfully challenging:
http://www.cs2bus.com/sharedfiles/filedetails?id=378738534

Here's how to prevent trapping:
http://www.cs2bus.com/sharedfiles/filedetails?id=264300097

Try my SP map?
http://www.cs2bus.com/sharedfiles/filedetails?id=377129237
Try my COOP map?
http://www.cs2bus.com/sharedfiles/filedetails?id=376181211