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

Annoyingly placed turrets aren't challenging. Annoyingly placed turrets are annoying. Light bridge not needed because I was quick enough to get the cube with portals. Antlines serve a dual purpose: They tell the player what activates what and leads players where to go next. Wandering around hoping to find a button isn't a puzzle, it is aimless and unfocused because you hid the antlines.

Try my SP map?
http://www.gtm.steamproxy.vip/sharedfiles/filedetails?id=192976369
Try my COOP map?
http://www.gtm.steamproxy.vip/sharedfiles/filedetails?id=181160432

I have lost ball a couple of times wandering around; after localizating buttons it went smooth. Second attempt took 40 sec. Nice chamber :)

Yeah, I finished it :)

Thank You! Did You finished this?

I like the position of the buttons, really have to look for them. nice chamber