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:)
As for the layout of the two chambers, it is probably better if you create a linear path instead of a circle back to the "main hub" because the hallways with the occasional button felt more like filler than anything. The puzzles are kind of dissappointing and wasn't very well paced. I don't think it introduces the concepts very well and it gets too complicated too fast. Needs a bit more of a streamlined approachs similar to how the single player story mode introduced blue gel. Maybe I can help by designing a mini series.
http://www.gtm.steamproxy.vip/sharedfiles/filedetails?id=390085124
http://www.gtm.steamproxy.vip/id/FelixGriffin
The reflection gel was an unused gel but still found in the catacombs of Hammer when creating Portal 2 content. That is how adhesive gel was first found but was removed eventually for good after the slip when Portal 2 Authoring Tools - Beta was first released.
http://www.youtube.com/watch?v=U-A1s67wK2Q
http://www.theportalwiki.com/wiki/Adhesion_Gel